20139795 has 48 divisors (see below), whose sum is σ = 38001600. Its totient is φ = 9808128.

The previous prime is 20139793. The next prime is 20139851. The reversal of 20139795 is 59793102.

It is not a de Polignac number, because 20139795 - 2¹ = 20139793 is a prime.

It is a super-2 number, since 2×20139795² = 811222685284050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20139793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 101106 + ... + 101304.

It is an arithmetic number, because the mean of its divisors is an integer number (791700).

Almost surely, 2^20139795 is an apocalyptic number.

20139795 is a deficient number, since it is larger than the sum of its proper divisors (17861805).

20139795 is a wasteful number, since it uses less digits than its factorization.

20139795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 20139795 is about 4487.7382945087. The cubic root of 20139795 is about 272.0727305147.

The spelling of 20139795 in words is "twenty million, one hundred thirty-nine thousand, seven hundred ninety-five".