20615615140 has 24 divisors (see below), whose sum is σ = 43295749560. Its totient is φ = 8245682688.

The previous prime is 20615615081. The next prime is 20615615179. The reversal of 20615615140 is 4151651602.

It can be written as a sum of positive squares in 4 ways, for example, as 56070144 + 20559544996 = 7488^2 + 143386^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390226 + ... + 439894.

It is an arithmetic number, because the mean of its divisors is an integer number (1803989565).

Almost surely, 2^20615615140 is an apocalyptic number.

20615615140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20615615140 is an abundant number, since it is smaller than the sum of its proper divisors (22680134420).

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

20615615140 is a wasteful number, since it uses less digits than its factorization.

20615615140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70431 (or 70429 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 20615615140 in words is "twenty billion, six hundred fifteen million, six hundred fifteen thousand, one hundred forty".