20490388 has 24 divisors (see below), whose sum is σ = 36942080. Its totient is φ = 9940320.

The previous prime is 20490373. The next prime is 20490391. The reversal of 20490388 is 88309402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18745 + ... + 19807.

Almost surely, 2^20490388 is an apocalyptic number.

It is an amenable number.

20490388 is a deficient number, since it is larger than the sum of its proper divisors (16451692).

20490388 is a wasteful number, since it uses less digits than its factorization.

20490388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207 (or 1205 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20490388 is about 4526.6309767862. The cubic root of 20490388 is about 273.6424020611.

The spelling of 20490388 in words is "twenty million, four hundred ninety thousand, three hundred eighty-eight".