20953880 has 16 divisors (see below), whose sum is σ = 47146320. Its totient is φ = 8381536.

The previous prime is 20953879. The next prime is 20953883. The reversal of 20953880 is 8835902.

It is a self number, because there is not a number n which added to its sum of digits gives 20953880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20953883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261884 + ... + 261963.

It is an arithmetic number, because the mean of its divisors is an integer number (2946645).

Almost surely, 2^20953880 is an apocalyptic number.

20953880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20953880 is an abundant number, since it is smaller than the sum of its proper divisors (26192440).

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

20953880 is a wasteful number, since it uses less digits than its factorization.

20953880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523858 (or 523854 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 20953880 is about 4577.5408245039. The cubic root of 20953880 is about 275.6902988353.

The spelling of 20953880 in words is "twenty million, nine hundred fifty-three thousand, eight hundred eighty".