20731475 has 12 divisors (see below), whose sum is σ = 26092824. Its totient is φ = 16336320.

The previous prime is 20731457. The next prime is 20731499. The reversal of 20731475 is 57413702.

It is not a de Polignac number, because 20731475 - 2⁶ = 20731411 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4514 + ... + 7863.

It is an arithmetic number, because the mean of its divisors is an integer number (2174402).

Almost surely, 2^20731475 is an apocalyptic number.

20731475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20731475 is a deficient number, since it is larger than the sum of its proper divisors (5361349).

20731475 is a wasteful number, since it uses less digits than its factorization.

20731475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12454 (or 12449 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 20731475 is about 4553.1829526168. The cubic root of 20731475 is about 274.7114328394.

The spelling of 20731475 in words is "twenty million, seven hundred thirty-one thousand, four hundred seventy-five".