20973456 has 60 divisors (see below), whose sum is σ = 67084992. Its totient is φ = 5992128.

The previous prime is 20973451. The next prime is 20973457. The reversal of 20973456 is 65437902.

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 20973456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20973451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9396 + ... + 11411.

Almost surely, 2^20973456 is an apocalyptic number.

It is an amenable number.

20973456 is an abundant number, since it is smaller than the sum of its proper divisors (46111536).

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

20973456 is a wasteful number, since it uses less digits than its factorization.

20973456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20828 (or 20819 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 20973456 is about 4579.6785913424. The cubic root of 20973456 is about 275.7761259548.

The spelling of 20973456 in words is "twenty million, nine hundred seventy-three thousand, four hundred fifty-six".