20953539 has 8 divisors (see below), whose sum is σ = 31042320. Its totient is φ = 13969008.

The previous prime is 20953531. The next prime is 20953553. The reversal of 20953539 is 93535902.

It is not a de Polignac number, because 20953539 - 2³ = 20953531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20953531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388002 + ... + 388055.

It is an arithmetic number, because the mean of its divisors is an integer number (3880290).

Almost surely, 2^20953539 is an apocalyptic number.

20953539 is a deficient number, since it is larger than the sum of its proper divisors (10088781).

20953539 is an equidigital number, since it uses as much as digits as its factorization.

20953539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776066 (or 776060 counting only the distinct ones).

The product of its (nonzero) digits is 36450, while the sum is 36.

The square root of 20953539 is about 4577.5035772788. The cubic root of 20953539 is about 275.6888033143.

The spelling of 20953539 in words is "twenty million, nine hundred fifty-three thousand, five hundred thirty-nine".