20523745 has 16 divisors (see below), whose sum is σ = 27151488. Its totient is φ = 14768640.

The previous prime is 20523721. The next prime is 20523787. The reversal of 20523745 is 54732502.

It is not a de Polignac number, because 20523745 - 2¹³ = 20515553 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3412 + ... + 7258.

It is an arithmetic number, because the mean of its divisors is an integer number (1696968).

Almost surely, 2^20523745 is an apocalyptic number.

It is an amenable number.

20523745 is a deficient number, since it is larger than the sum of its proper divisors (6627743).

20523745 is a wasteful number, since it uses less digits than its factorization.

20523745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3960.

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 20523745 is about 4530.3140067770. The cubic root of 20523745 is about 273.7908121495.

The spelling of 20523745 in words is "twenty million, five hundred twenty-three thousand, seven hundred forty-five".