20768280 has 64 divisors (see below), whose sum is σ = 67102560. Its totient is φ = 5111808.

The previous prime is 20768249. The next prime is 20768291. The reversal of 20768280 is 8286702.

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, 5097 + ... + 8216.

Almost surely, 2^20768280 is an apocalyptic number.

20768280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20768280 is an abundant number, since it is smaller than the sum of its proper divisors (46334280).

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

20768280 is a wasteful number, since it uses less digits than its factorization.

20768280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13340 (or 13336 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 20768280 is about 4557.2228385279. Note that the first 3 decimals coincide. The cubic root of 20768280 is about 274.8739036221.

The spelling of 20768280 in words is "twenty million, seven hundred sixty-eight thousand, two hundred eighty".