20920475 has 12 divisors (see below), whose sum is σ = 26211864. Its totient is φ = 16561920.

The previous prime is 20920469. The next prime is 20920477. The reversal of 20920475 is 57402902.

It is not a de Polignac number, because 20920475 - 2⁶ = 20920411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20920477) 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, 1889 + ... + 6738.

It is an arithmetic number, because the mean of its divisors is an integer number (2184322).

Almost surely, 2^20920475 is an apocalyptic number.

20920475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20920475 is a deficient number, since it is larger than the sum of its proper divisors (5291389).

20920475 is an equidigital number, since it uses as much as digits as its factorization.

20920475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8734 (or 8729 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20920475 is about 4573.8905758665. The cubic root of 20920475 is about 275.5437176658.

It can be divided in two parts, 209 and 20475, that multiplied together give a triangular number (4279275 = T₂₉₂₅).

The spelling of 20920475 in words is "twenty million, nine hundred twenty thousand, four hundred seventy-five".