20655328 has 24 divisors (see below), whose sum is σ = 40822488. Its totient is φ = 10287744.

The previous prime is 20655301. The next prime is 20655329. The reversal of 20655328 is 82355602.

It is a happy number.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20655328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655329) 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, 8275 + ... + 10477.

It is an arithmetic number, because the mean of its divisors is an integer number (1700937).

Almost surely, 2^20655328 is an apocalyptic number.

It is an amenable number.

20655328 is a deficient number, since it is larger than the sum of its proper divisors (20167160).

20655328 is a wasteful number, since it uses less digits than its factorization.

20655328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2506 (or 2498 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 20655328 is about 4544.8133074968. The cubic root of 20655328 is about 274.3746805482.

The spelling of 20655328 in words is "twenty million, six hundred fifty-five thousand, three hundred twenty-eight".