20823415137 has 24 divisors (see below), whose sum is σ = 34708911744. Its totient is φ = 11783565504.

The previous prime is 20823415133. The next prime is 20823415163. The reversal of 20823415137 is 73151432802.

20823415137 is a `hidden beast` number, since 20 + 82 + 3 + 41 + 513 + 7 = 666.

It is not a de Polignac number, because 20823415137 - 2² = 20823415133 is a prime.

It is a super-2 number, since 2×20823415137² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20823415133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1598028 + ... + 1611005.

It is an arithmetic number, because the mean of its divisors is an integer number (1446204656).

Almost surely, 2^20823415137 is an apocalyptic number.

It is an amenable number.

20823415137 is a deficient number, since it is larger than the sum of its proper divisors (13885496607).

20823415137 is a wasteful number, since it uses less digits than its factorization.

20823415137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3209149 (or 3209146 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

Adding to 20823415137 its reverse (73151432802), we get a palindrome (93974847939).

The spelling of 20823415137 in words is "twenty billion, eight hundred twenty-three million, four hundred fifteen thousand, one hundred thirty-seven".