20715475 has 12 divisors (see below), whose sum is σ = 28022760. Its totient is φ = 15065600.

The previous prime is 20715473. The next prime is 20715493. The reversal of 20715475 is 57451702.

It is not a de Polignac number, because 20715475 - 2¹ = 20715473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20715473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37390 + ... + 37939.

It is an arithmetic number, because the mean of its divisors is an integer number (2335230).

Almost surely, 2^20715475 is an apocalyptic number.

20715475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20715475 is a deficient number, since it is larger than the sum of its proper divisors (7307285).

20715475 is a wasteful number, since it uses less digits than its factorization.

20715475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75350 (or 75345 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 20715475 is about 4551.4256008420. The cubic root of 20715475 is about 274.6407429962.

The spelling of 20715475 in words is "twenty million, seven hundred fifteen thousand, four hundred seventy-five".