20623685856 has 24 divisors (see below), whose sum is σ = 54137175624. Its totient is φ = 6874561920.

The previous prime is 20623685837. The next prime is 20623685867. The reversal of 20623685856 is 65858632602.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 20623685799 and 20623685808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107414935 + ... + 107415126.

It is an arithmetic number, because the mean of its divisors is an integer number (2255715651).

Almost surely, 2^20623685856 is an apocalyptic number.

It is an amenable number.

20623685856 is an abundant number, since it is smaller than the sum of its proper divisors (33513489768).

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

20623685856 is a wasteful number, since it uses less digits than its factorization.

20623685856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214830074 (or 214830066 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 51.

The spelling of 20623685856 in words is "twenty billion, six hundred twenty-three million, six hundred eighty-five thousand, eight hundred fifty-six".