20953188 has 48 divisors (see below), whose sum is σ = 54774720. Its totient is φ = 6926400.

The previous prime is 20953183. The next prime is 20953189. The reversal of 20953188 is 88135902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20953183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13408 + ... + 14888.

It is an arithmetic number, because the mean of its divisors is an integer number (1141140).

Almost surely, 2^20953188 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20953188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27387360).

20953188 is an abundant number, since it is smaller than the sum of its proper divisors (33821532).

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

20953188 is a wasteful number, since it uses less digits than its factorization.

20953188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1625 (or 1617 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 20953188 is about 4577.4652374431. The cubic root of 20953188 is about 275.6872639195.

The spelling of 20953188 in words is "twenty million, nine hundred fifty-three thousand, one hundred eighty-eight".