20953508 has 6 divisors (see below), whose sum is σ = 36668646. Its totient is φ = 10476752.

The previous prime is 20953481. The next prime is 20953531. The reversal of 20953508 is 80535902.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15038884 + 5914624 = 3878^2 + 2432^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2619185 + ... + 2619192.

It is an arithmetic number, because the mean of its divisors is an integer number (6111441).

Almost surely, 2^20953508 is an apocalyptic number.

It is an amenable number.

20953508 is a deficient number, since it is larger than the sum of its proper divisors (15715138).

20953508 is a wasteful number, since it uses less digits than its factorization.

20953508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5238381 (or 5238379 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 20953508 is about 4577.5001911524. The cubic root of 20953508 is about 275.6886673571.

The spelling of 20953508 in words is "twenty million, nine hundred fifty-three thousand, five hundred eight".