20490638 has 8 divisors (see below), whose sum is σ = 35126832. Its totient is φ = 8781696.

The previous prime is 20490623. The next prime is 20490649. The reversal of 20490638 is 83609402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 731795 + ... + 731822.

It is an arithmetic number, because the mean of its divisors is an integer number (4390854).

Almost surely, 2^20490638 is an apocalyptic number.

20490638 is a deficient number, since it is larger than the sum of its proper divisors (14636194).

20490638 is a wasteful number, since it uses less digits than its factorization.

20490638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1463626.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 20490638 is about 4526.6585910581. The cubic root of 20490638 is about 273.6435149459.

The spelling of 20490638 in words is "twenty million, four hundred ninety thousand, six hundred thirty-eight".