20901965976 has 128 divisors (see below), whose sum is σ = 59546150400. Its totient is φ = 6789847680.

The previous prime is 20901965941. The next prime is 20901965983. The reversal of 20901965976 is 67956910902.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4520946 + ... + 4525566.

It is an arithmetic number, because the mean of its divisors is an integer number (465204300).

Almost surely, 2^20901965976 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 20901965976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29773075200).

20901965976 is an abundant number, since it is smaller than the sum of its proper divisors (38644184424).

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

20901965976 is a wasteful number, since it uses less digits than its factorization.

20901965976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5166 (or 5156 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 54.

The spelling of 20901965976 in words is "twenty billion, nine hundred one million, nine hundred sixty-five thousand, nine hundred seventy-six".