20785475 has 12 divisors (see below), whose sum is σ = 27290664. Its totient is φ = 15649920.

The previous prime is 20785447. The next prime is 20785493. The reversal of 20785475 is 57458702.

It is not a de Polignac number, because 20785475 - 2¹⁰ = 20784451 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24029 + ... + 24878.

It is an arithmetic number, because the mean of its divisors is an integer number (2274222).

Almost surely, 2^20785475 is an apocalyptic number.

20785475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20785475 is a deficient number, since it is larger than the sum of its proper divisors (6505189).

20785475 is a wasteful number, since it uses less digits than its factorization.

20785475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48934 (or 48929 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 38.

The square root of 20785475 is about 4559.1090138315. The cubic root of 20785475 is about 274.9497428820.

The spelling of 20785475 in words is "twenty million, seven hundred eighty-five thousand, four hundred seventy-five".