20818813968 has 40 divisors (see below), whose sum is σ = 59757708000. Its totient is φ = 6939604512.

The previous prime is 20818813957. The next prime is 20818813979. The reversal of 20818813968 is 86931881802.

It is an interprime number because it is at equal distance from previous prime (20818813957) and next prime (20818813979).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24095418 + ... + 24096281.

It is an arithmetic number, because the mean of its divisors is an integer number (1493942700).

Almost surely, 2^20818813968 is an apocalyptic number.

It is an amenable number.

20818813968 is an abundant number, since it is smaller than the sum of its proper divisors (38938894032).

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

20818813968 is a wasteful number, since it uses less digits than its factorization.

20818813968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48191716 (or 48191704 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 54.

The spelling of 20818813968 in words is "twenty billion, eight hundred eighteen million, eight hundred thirteen thousand, nine hundred sixty-eight".