20215769508 has 96 divisors (see below), whose sum is σ = 57981450240. Its totient is φ = 6039684000.

The previous prime is 20215769503. The next prime is 20215769527. The reversal of 20215769508 is 80596751202.

20215769508 is a `hidden beast` number, since 2 + 0 + 21 + 576 + 9 + 50 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (20215769503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35488 + ... + 204183.

It is an arithmetic number, because the mean of its divisors is an integer number (603973440).

Almost surely, 2^20215769508 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20215769508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28990725120).

20215769508 is an abundant number, since it is smaller than the sum of its proper divisors (37765680732).

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

20215769508 is a wasteful number, since it uses less digits than its factorization.

20215769508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239766 (or 239758 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 20215769508 in words is "twenty billion, two hundred fifteen million, seven hundred sixty-nine thousand, five hundred eight".