20402655 has 32 divisors (see below), whose sum is σ = 40180224. Its totient is φ = 8608896.

The previous prime is 20402647. The next prime is 20402663. The reversal of 20402655 is 55620402.

It is an interprime number because it is at equal distance from previous prime (20402647) and next prime (20402663).

It is not a de Polignac number, because 20402655 - 2³ = 20402647 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6109 + ... + 8838.

It is an arithmetic number, because the mean of its divisors is an integer number (1255632).

Almost surely, 2^20402655 is an apocalyptic number.

20402655 is a deficient number, since it is larger than the sum of its proper divisors (19777569).

20402655 is a wasteful number, since it uses less digits than its factorization.

20402655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14975.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20402655 is about 4516.9298201323. The cubic root of 20402655 is about 273.2512948651.

The spelling of 20402655 in words is "twenty million, four hundred two thousand, six hundred fifty-five".