20973612 has 48 divisors (see below), whose sum is σ = 55238400. Its totient is φ = 6135360.

The previous prime is 20973607. The next prime is 20973643. The reversal of 20973612 is 21637902.

It is a self number, because there is not a number n which added to its sum of digits gives 20973612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1089 + ... + 6567.

It is an arithmetic number, because the mean of its divisors is an integer number (1150800).

Almost surely, 2^20973612 is an apocalyptic number.

20973612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20973612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27619200).

20973612 is an abundant number, since it is smaller than the sum of its proper divisors (34264788).

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

20973612 is a wasteful number, since it uses less digits than its factorization.

20973612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5526 (or 5524 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 20973612 is about 4579.6956230737. The cubic root of 20973612 is about 275.7768096916.

The spelling of 20973612 in words is "twenty million, nine hundred seventy-three thousand, six hundred twelve".