20615313140 has 12 divisors (see below), whose sum is σ = 43292157636. Its totient is φ = 8246125248.

The previous prime is 20615313137. The next prime is 20615313151. The reversal of 20615313140 is 4131351602.

It can be written as a sum of positive squares in 2 ways, for example, as 5344779664 + 15270533476 = 73108^2 + 123574^2 .

It is a super-2 number, since 2×20615313140² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515382809 + ... + 515382848.

It is an arithmetic number, because the mean of its divisors is an integer number (3607679803).

Almost surely, 2^20615313140 is an apocalyptic number.

20615313140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20615313140 is an abundant number, since it is smaller than the sum of its proper divisors (22676844496).

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

20615313140 is a wasteful number, since it uses less digits than its factorization.

20615313140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030765666 (or 1030765664 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 20615313140 its reverse (4131351602), we get a palindrome (24746664742).

The spelling of 20615313140 in words is "twenty billion, six hundred fifteen million, three hundred thirteen thousand, one hundred forty".