20364138 has 12 divisors (see below), whose sum is σ = 44122338. Its totient is φ = 6788040.

The previous prime is 20364109. The next prime is 20364139. The reversal of 20364138 is 83146302.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20007729 + 356409 = 4473^2 + 597^2 .

It is not an unprimeable number, because it can be changed into a prime (20364139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 565653 + ... + 565688.

Almost surely, 2^20364138 is an apocalyptic number.

20364138 is an abundant number, since it is smaller than the sum of its proper divisors (23758200).

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

20364138 is a wasteful number, since it uses less digits than its factorization.

20364138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131349 (or 1131346 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20364138 is about 4512.6641798388. The cubic root of 20364138 is about 273.0792347395.

It can be divided in two parts, 20364 and 138, that added together give a palindrome (20502).

The spelling of 20364138 in words is "twenty million, three hundred sixty-four thousand, one hundred thirty-eight".