20954655820 has 48 divisors (see below), whose sum is σ = 50299679808. Its totient is φ = 7183238400.

The previous prime is 20954655817. The next prime is 20954655823. The reversal of 20954655820 is 2855645902.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20954655817) and next prime (20954655823).

It is not an unprimeable number, because it can be changed into a prime (20954655823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1309870 + ... + 1325770.

It is an arithmetic number, because the mean of its divisors is an integer number (1047909996).

Almost surely, 2^20954655820 is an apocalyptic number.

20954655820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20954655820 is an abundant number, since it is smaller than the sum of its proper divisors (29345023988).

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

20954655820 is a wasteful number, since it uses less digits than its factorization.

20954655820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25330 (or 25328 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 46.

The spelling of 20954655820 in words is "twenty billion, nine hundred fifty-four million, six hundred fifty-five thousand, eight hundred twenty".