20553388 has 6 divisors (see below), whose sum is σ = 35968436. Its totient is φ = 10276692.

The previous prime is 20553361. The next prime is 20553433. The reversal of 20553388 is 88335502.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2569170 + ... + 2569177.

Almost surely, 2^20553388 is an apocalyptic number.

It is an amenable number.

20553388 is a deficient number, since it is larger than the sum of its proper divisors (15415048).

20553388 is a wasteful number, since it uses less digits than its factorization.

20553388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5138351 (or 5138349 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 20553388 is about 4533.5844538290. The cubic root of 20553388 is about 273.9225632309.

The spelling of 20553388 in words is "twenty million, five hundred fifty-three thousand, three hundred eighty-eight".