20834138 has 16 divisors (see below), whose sum is σ = 33906600. Its totient is φ = 9543936.

The previous prime is 20834137. The next prime is 20834147. The reversal of 20834138 is 83143802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13667809 + 7166329 = 3697^2 + 2677^2 .

It is a super-2 number, since 2×20834138² = 868122612406088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20834138.

It is not an unprimeable number, because it can be changed into a prime (20834137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 638 + ... + 6486.

Almost surely, 2^20834138 is an apocalyptic number.

20834138 is a deficient number, since it is larger than the sum of its proper divisors (13072462).

20834138 is a wasteful number, since it uses less digits than its factorization.

20834138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6001.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20834138 is about 4564.4427918422. The cubic root of 20834138 is about 275.1641466300.

The spelling of 20834138 in words is "twenty million, eight hundred thirty-four thousand, one hundred thirty-eight".