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20871813100 = 22521087192013
BaseRepresentation
bin10011011100000011…
…101001011111101100
31222212120222221222211
4103130003221133230
5320221141004400
613331031220204
71336136325025
oct233403513754
958776887884
1020871813100
11894065a116
124065b17664
131c781b2688
14101ddc5c4c
1582257adba
hex4dc0e97ec

20871813100 has 36 divisors (see below), whose sum is σ = 45333737344. Its totient is φ = 8341001280.

The previous prime is 20871813049. The next prime is 20871813119. The reversal of 20871813100 is 131817802.

It is a happy number.

It is a super-2 number, since 2×208718131002 (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12694 + ... + 204706.

Almost surely, 220871813100 is an apocalyptic number.

20871813100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20871813100 is an abundant number, since it is smaller than the sum of its proper divisors (24461924244).

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

20871813100 is a wasteful number, since it uses less digits than its factorization.

20871813100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193114 (or 193107 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 31.

The spelling of 20871813100 in words is "twenty billion, eight hundred seventy-one million, eight hundred thirteen thousand, one hundred".

Divisors: 1 2 4 5 10 20 25 50 100 1087 2174 4348 5435 10870 21740 27175 54350 108700 192013 384026 768052 960065 1920130 3840260 4800325 9600650 19201300 208718131 417436262 834872524 1043590655 2087181310 4174362620 5217953275 10435906550 20871813100