20653960 has 16 divisors (see below), whose sum is σ = 46471500. Its totient is φ = 8261568.

The previous prime is 20653957. The next prime is 20653961. The reversal of 20653960 is 6935602.

It can be written as a sum of positive squares in 2 ways, for example, as 20593444 + 60516 = 4538^2 + 246^2 .

It is not an unprimeable number, because it can be changed into a prime (20653961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258135 + ... + 258214.

Almost surely, 2^20653960 is an apocalyptic number.

20653960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20653960 is an abundant number, since it is smaller than the sum of its proper divisors (25817540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20653960 is a wasteful number, since it uses less digits than its factorization.

20653960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516360 (or 516356 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 20653960 is about 4544.6628037732. The cubic root of 20653960 is about 274.3686231466.

The spelling of 20653960 in words is "twenty million, six hundred fifty-three thousand, nine hundred sixty".