20400653 has 32 divisors (see below), whose sum is σ = 26455296. Its totient is φ = 15303168.

The previous prime is 20400637. The next prime is 20400671. The reversal of 20400653 is 35600402.

It is a cyclic number.

It is not a de Polignac number, because 20400653 - 2⁴ = 20400637 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400673) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 245750 + ... + 245832.

It is an arithmetic number, because the mean of its divisors is an integer number (826728).

Almost surely, 2^20400653 is an apocalyptic number.

It is an amenable number.

20400653 is a deficient number, since it is larger than the sum of its proper divisors (6054643).

20400653 is a wasteful number, since it uses less digits than its factorization.

20400653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20400653 is about 4516.7082039910. The cubic root of 20400653 is about 273.2423570253.

The spelling of 20400653 in words is "twenty million, four hundred thousand, six hundred fifty-three".