20616620570 has 32 divisors (see below), whose sum is σ = 45673746048. Its totient is φ = 6524820288.

The previous prime is 20616620551. The next prime is 20616620581. The reversal of 20616620570 is 7502661602.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20616620570.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11326904 + ... + 11328723.

It is an arithmetic number, because the mean of its divisors is an integer number (1427304564).

Almost surely, 2^20616620570 is an apocalyptic number.

20616620570 is an abundant number, since it is smaller than the sum of its proper divisors (25057125478).

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

20616620570 is a wasteful number, since it uses less digits than its factorization.

20616620570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22655654.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 20616620570 in words is "twenty billion, six hundred sixteen million, six hundred twenty thousand, five hundred seventy".