20953590 has 64 divisors (see below), whose sum is σ = 58046976. Its totient is φ = 4741632.

The previous prime is 20953579. The next prime is 20953607. The reversal of 20953590 is 9535902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23289 + ... + 24171.

It is an arithmetic number, because the mean of its divisors is an integer number (906984).

Almost surely, 2^20953590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20953590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29023488).

20953590 is an abundant number, since it is smaller than the sum of its proper divisors (37093386).

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

20953590 is a wasteful number, since it uses less digits than its factorization.

20953590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013.

The product of its (nonzero) digits is 12150, while the sum is 33.

The square root of 20953590 is about 4577.5091479974. The cubic root of 20953590 is about 275.6890269857.

The spelling of 20953590 in words is "twenty million, nine hundred fifty-three thousand, five hundred ninety".