20704138 has 16 divisors (see below), whose sum is σ = 38223360. Its totient is φ = 8190576.

The previous prime is 20704093. The next prime is 20704141. The reversal of 20704138 is 83140702.

It is a super-2 number, since 2×20704138² = 857322660646088, which contains 22 as substring.

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, 56698 + ... + 57061.

It is an arithmetic number, because the mean of its divisors is an integer number (2388960).

Almost surely, 2^20704138 is an apocalyptic number.

20704138 is a deficient number, since it is larger than the sum of its proper divisors (17519222).

20704138 is a wasteful number, since it uses less digits than its factorization.

20704138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113781.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20704138 is about 4550.1799964397. The cubic root of 20704138 is about 274.5906327883.

The spelling of 20704138 in words is "twenty million, seven hundred four thousand, one hundred thirty-eight".