20895138 has 64 divisors (see below), whose sum is σ = 52444800. Its totient is φ = 6108480.

The previous prime is 20895107. The next prime is 20895139. The reversal of 20895138 is 83159802.

It is not an unprimeable number, because it can be changed into a prime (20895139) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16620 + ... + 17832.

It is an arithmetic number, because the mean of its divisors is an integer number (819450).

Almost surely, 2^20895138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20895138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26222400).

20895138 is an abundant number, since it is smaller than the sum of its proper divisors (31549662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20895138 is a wasteful number, since it uses less digits than its factorization.

20895138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264 (or 1258 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 20895138 is about 4571.1199940496. The cubic root of 20895138 is about 275.4324347956.

It can be divided in two parts, 2089 and 5138, that added together give a palindrome (7227).

The spelling of 20895138 in words is "twenty million, eight hundred ninety-five thousand, one hundred thirty-eight".