20953170 has 96 divisors (see below), whose sum is σ = 63198720. Its totient is φ = 4717440.

The previous prime is 20953151. The next prime is 20953183. The reversal of 20953170 is 7135902.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49560 + ... + 49980.

It is an arithmetic number, because the mean of its divisors is an integer number (658320).

Almost surely, 2^20953170 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20953170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31599360).

20953170 is an abundant number, since it is smaller than the sum of its proper divisors (42245550).

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

20953170 is a wasteful number, since it uses less digits than its factorization.

20953170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 517 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 20953170 is about 4577.4632712890. The cubic root of 20953170 is about 275.6871849757.

The spelling of 20953170 in words is "twenty million, nine hundred fifty-three thousand, one hundred seventy".