20677157956 has 24 divisors (see below), whose sum is σ = 44535417920. Its totient is φ = 8179974432.

The previous prime is 20677157881. The next prime is 20677157981. The reversal of 20677157956 is 65975177602.

It is a super-2 number, since 2×20677157956² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20677157897 and 20677157906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28402326 + ... + 28403053.

Almost surely, 2^20677157956 is an apocalyptic number.

20677157956 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20677157956 is an abundant number, since it is smaller than the sum of its proper divisors (23858259964).

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

20677157956 is a wasteful number, since it uses less digits than its factorization.

20677157956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56805403 (or 56805401 counting only the distinct ones).

The product of its (nonzero) digits is 5556600, while the sum is 55.

The spelling of 20677157956 in words is "twenty billion, six hundred seventy-seven million, one hundred fifty-seven thousand, nine hundred fifty-six".