20615506730 has 64 divisors (see below), whose sum is σ = 48075068160. Its totient is φ = 6181069824.

The previous prime is 20615506729. The next prime is 20615506789. The reversal of 20615506730 is 3760551602.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 578879 + ... + 613458.

It is an arithmetic number, because the mean of its divisors is an integer number (751172940).

Almost surely, 2^20615506730 is an apocalyptic number.

20615506730 is an abundant number, since it is smaller than the sum of its proper divisors (27459561430).

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

20615506730 is a wasteful number, since it uses less digits than its factorization.

20615506730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192383.

The product of its (nonzero) digits is 37800, while the sum is 35.

The spelling of 20615506730 in words is "twenty billion, six hundred fifteen million, five hundred six thousand, seven hundred thirty".