20938490 has 16 divisors (see below), whose sum is σ = 37988352. Its totient is φ = 8308944.

The previous prime is 20938481. The next prime is 20938501. The reversal of 20938490 is 9483902.

It is a self number, because there is not a number n which added to its sum of digits gives 20938490.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6974 + ... + 9513.

It is an arithmetic number, because the mean of its divisors is an integer number (2374272).

Almost surely, 2^20938490 is an apocalyptic number.

20938490 is a deficient number, since it is larger than the sum of its proper divisors (17049862).

20938490 is a wasteful number, since it uses less digits than its factorization.

20938490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16621.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20938490 is about 4575.8594821083. The cubic root of 20938490 is about 275.6227868697.

The spelling of 20938490 in words is "twenty million, nine hundred thirty-eight thousand, four hundred ninety".