20901113856 has 832 divisors, whose sum is σ = 78633600000. Its totient is φ = 5462360064.

The previous prime is 20901113843. The next prime is 20901113861. The reversal of 20901113856 is 65831110902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20901113856.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 720728050 + ... + 720728078.

Almost surely, 2^20901113856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20901113856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39316800000).

20901113856 is an abundant number, since it is smaller than the sum of its proper divisors (57732486144).

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

20901113856 is an equidigital number, since it uses as much as digits as its factorization.

20901113856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 20901113856 in words is "twenty billion, nine hundred one million, one hundred thirteen thousand, eight hundred fifty-six".