Search a number
-
+
20777660980 = 2252399294679
BaseRepresentation
bin10011010110011100…
…011111001000110100
31222122000211112120021
4103112130133020310
5320023040122410
613313425214524
71333614130036
oct232634371064
958560745507
1020777660980
1188a24a224a
12403a491444
131c6183886b
1410116b7c56
1581917deda
hex4d671f234

20777660980 has 48 divisors (see below), whose sum is σ = 43872192000. Its totient is φ = 8265614336.

The previous prime is 20777660977. The next prime is 20777661029. The reversal of 20777660980 is 8906677702.

It is a happy number.

It is a super-2 number, since 2×207776609802 (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4438281 + ... + 4442959.

It is an arithmetic number, because the mean of its divisors is an integer number (914004000).

Almost surely, 220777660980 is an apocalyptic number.

20777660980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20777660980 is an abundant number, since it is smaller than the sum of its proper divisors (23094531020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20777660980 is a wasteful number, since it uses less digits than its factorization.

20777660980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856 (or 5854 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 52.

The spelling of 20777660980 in words is "twenty billion, seven hundred seventy-seven million, six hundred sixty thousand, nine hundred eighty".

Divisors: 1 2 4 5 10 20 239 478 929 956 1195 1858 2390 3716 4645 4679 4780 9290 9358 18580 18716 23395 46790 93580 222031 444062 888124 1110155 1118281 2220310 2236562 4346791 4440620 4473124 5591405 8693582 11182810 17387164 21733955 22365620 43467910 86935820 1038883049 2077766098 4155532196 5194415245 10388830490 20777660980