20312651613540 has 192 divisors, whose sum is σ = 70749191681280. Its totient is φ = 4278106767360.

The previous prime is 20312651613539. The next prime is 20312651613559. The reversal of 20312651613540 is 4531615621302.

It is a happy number.

It is a super-2 number, since 2×20312651613540² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 69484785 + ... + 69776504.

It is an arithmetic number, because the mean of its divisors is an integer number (368485373340).

Almost surely, 2^{20312651613540} is an apocalyptic number.

20312651613540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20312651613540 is an abundant number, since it is smaller than the sum of its proper divisors (50436540067740).

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

20312651613540 is a wasteful number, since it uses less digits than its factorization.

20312651613540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139261342 (or 139261340 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 20312651613540 in words is "twenty trillion, three hundred twelve billion, six hundred fifty-one million, six hundred thirteen thousand, five hundred forty".