20523975 has 12 divisors (see below), whose sum is σ = 33933096. Its totient is φ = 10946080.

The previous prime is 20523973. The next prime is 20523983. The reversal of 20523975 is 57932502.

It is not a de Polignac number, because 20523975 - 2¹ = 20523973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523973) 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, 136752 + ... + 136901.

It is an arithmetic number, because the mean of its divisors is an integer number (2827758).

Almost surely, 2^20523975 is an apocalyptic number.

20523975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20523975 is a deficient number, since it is larger than the sum of its proper divisors (13409121).

20523975 is a wasteful number, since it uses less digits than its factorization.

20523975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273666 (or 273661 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 33.

The square root of 20523975 is about 4530.3393912598. The cubic root of 20523975 is about 273.7918348941.

The spelling of 20523975 in words is "twenty million, five hundred twenty-three thousand, nine hundred seventy-five".