20725475 has 12 divisors (see below), whose sum is σ = 25827960. Its totient is φ = 16497600.

The previous prime is 20725469. The next prime is 20725477. The reversal of 20725475 is 57452702.

It is not a de Polignac number, because 20725475 - 2²² = 16531171 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20725477) 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, 3311 + ... + 7239.

It is an arithmetic number, because the mean of its divisors is an integer number (2152330).

Almost surely, 2^20725475 is an apocalyptic number.

20725475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20725475 is a deficient number, since it is larger than the sum of its proper divisors (5102485).

20725475 is a wasteful number, since it uses less digits than its factorization.

20725475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4150 (or 4145 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 32.

The square root of 20725475 is about 4552.5240251975. The cubic root of 20725475 is about 274.6849284119.

The spelling of 20725475 in words is "twenty million, seven hundred twenty-five thousand, four hundred seventy-five".