20655040 has 56 divisors (see below), whose sum is σ = 56217312. Its totient is φ = 7080960.

The previous prime is 20655023. The next prime is 20655049. The reversal of 20655040 is 4055602.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2371 + ... + 6850.

Almost surely, 2^20655040 is an apocalyptic number.

20655040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20655040 is an abundant number, since it is smaller than the sum of its proper divisors (35562272).

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

20655040 is an equidigital number, since it uses as much as digits as its factorization.

20655040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9245 (or 9235 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20655040 is about 4544.7816229166. The cubic root of 20655040 is about 274.3734053280.

The spelling of 20655040 in words is "twenty million, six hundred fifty-five thousand, forty".