20938090 has 12 divisors (see below), whose sum is σ = 37714626. Its totient is φ = 8369448.

The previous prime is 20938069. The next prime is 20938091. The reversal of 20938090 is 9083902.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18844281 + 2093809 = 4341^2 + 1447^2 .

It is a super-2 number, since 2×20938090² = 876807225696200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20938091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13747 + ... + 15193.

Almost surely, 2^20938090 is an apocalyptic number.

20938090 is a deficient number, since it is larger than the sum of its proper divisors (16776536).

20938090 is an frugal number, since it uses more digits than its factorization.

20938090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2901 (or 1454 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 20938090 is about 4575.8157742636. The cubic root of 20938090 is about 275.6210317317.

The spelling of 20938090 in words is "twenty million, nine hundred thirty-eight thousand, ninety".