20539475 has 24 divisors (see below), whose sum is σ = 29254080. Its totient is φ = 14148000.

The previous prime is 20539433. The next prime is 20539481. The reversal of 20539475 is 57493502.

It is not a de Polignac number, because 20539475 - 2⁶ = 20539411 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3260 + ... + 7190.

It is an arithmetic number, because the mean of its divisors is an integer number (1218920).

Almost surely, 2^20539475 is an apocalyptic number.

20539475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20539475 is a deficient number, since it is larger than the sum of its proper divisors (8714605).

20539475 is a wasteful number, since it uses less digits than its factorization.

20539475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3971 (or 3966 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 20539475 is about 4532.0497570084. The cubic root of 20539475 is about 273.8607413896.

The spelling of 20539475 in words is "twenty million, five hundred thirty-nine thousand, four hundred seventy-five".