20953620 has 48 divisors (see below), whose sum is σ = 65190720. Its totient is φ = 5587488.

The previous prime is 20953607. The next prime is 20953633. The reversal of 20953620 is 2635902.

It is an interprime number because it is at equal distance from previous prime (20953607) and next prime (20953633).

It is a super-2 number, since 2×20953620² = 878108382208800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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, 18862 + ... + 19941.

It is an arithmetic number, because the mean of its divisors is an integer number (1358140).

Almost surely, 2^20953620 is an apocalyptic number.

20953620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20953620 is an abundant number, since it is smaller than the sum of its proper divisors (44237100).

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

20953620 is a wasteful number, since it uses less digits than its factorization.

20953620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38821 (or 38813 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 20953620 is about 4577.5124248876. The cubic root of 20953620 is about 275.6891585569.

The spelling of 20953620 in words is "twenty million, nine hundred fifty-three thousand, six hundred twenty".