20861032672 has 48 divisors (see below), whose sum is σ = 43309244160. Its totient is φ = 9863828352.

The previous prime is 20861032663. The next prime is 20861032681. The reversal of 20861032672 is 27623016802.

It is an interprime number because it is at equal distance from previous prime (20861032663) and next prime (20861032681).

It is a congruent number.

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, 311833 + ... + 372775.

It is an arithmetic number, because the mean of its divisors is an integer number (902275920).

Almost surely, 2^20861032672 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 20861032672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21654622080).

20861032672 is an abundant number, since it is smaller than the sum of its proper divisors (22448211488).

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

20861032672 is a wasteful number, since it uses less digits than its factorization.

20861032672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61535 (or 61527 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 20861032672 in words is "twenty billion, eight hundred sixty-one million, thirty-two thousand, six hundred seventy-two".