20650525818 has 32 divisors (see below), whose sum is σ = 44503722816. Its totient is φ = 6350341248.

The previous prime is 20650525811. The next prime is 20650525829. The reversal of 20650525818 is 81852505602.

It is a self number, because there is not a number n which added to its sum of digits gives 20650525818.

It is not an unprimeable number, because it can be changed into a prime (20650525811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61221 + ... + 212247.

It is an arithmetic number, because the mean of its divisors is an integer number (1390741338).

Almost surely, 2^20650525818 is an apocalyptic number.

20650525818 is an abundant number, since it is smaller than the sum of its proper divisors (23853196998).

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

20650525818 is a wasteful number, since it uses less digits than its factorization.

20650525818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152798.

The product of its (nonzero) digits is 192000, while the sum is 42.

The spelling of 20650525818 in words is "twenty billion, six hundred fifty million, five hundred twenty-five thousand, eight hundred eighteen".