20973975 has 24 divisors (see below), whose sum is σ = 37830912. Its totient is φ = 10168800.

The previous prime is 20973959. The next prime is 20973977. The reversal of 20973975 is 57937902.

It is not a de Polignac number, because 20973975 - 2⁴ = 20973959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20973977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11887 + ... + 13536.

It is an arithmetic number, because the mean of its divisors is an integer number (1576288).

Almost surely, 2^20973975 is an apocalyptic number.

20973975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20973975 is a deficient number, since it is larger than the sum of its proper divisors (16856937).

20973975 is a wasteful number, since it uses less digits than its factorization.

20973975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25447 (or 25442 counting only the distinct ones).

The product of its (nonzero) digits is 119070, while the sum is 42.

The square root of 20973975 is about 4579.7352543570. The cubic root of 20973975 is about 275.7784006813.

The spelling of 20973975 in words is "twenty million, nine hundred seventy-three thousand, nine hundred seventy-five".