20694485656 has 32 divisors (see below), whose sum is σ = 42177497040. Its totient is φ = 9462031488.

The previous prime is 20694485627. The next prime is 20694485677. The reversal of 20694485656 is 65658449602.

It is a junction number, because it is equal to n+sod(n) for n = 20694485597 and 20694485606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 918711 + ... + 940966.

Almost surely, 2^20694485656 is an apocalyptic number.

20694485656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20694485656 is an abundant number, since it is smaller than the sum of its proper divisors (21483011384).

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

20694485656 is a wasteful number, since it uses less digits than its factorization.

20694485656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859803 (or 1859799 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 55.

The spelling of 20694485656 in words is "twenty billion, six hundred ninety-four million, four hundred eighty-five thousand, six hundred fifty-six".