20521020722 has 16 divisors (see below), whose sum is σ = 32607748152. Its totient is φ = 9652346880.

The previous prime is 20521020713. The next prime is 20521020757. The reversal of 20521020722 is 22702012502.

It can be written as a sum of positive squares in 4 ways, for example, as 9621451921 + 10899568801 = 98089^2 + 104401^2 .

It is a super-2 number, since 2×20521020722² (a number of 21 digits) contains 22 as substring.

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, 70979 + ... + 214662.

Almost surely, 2^20521020722 is an apocalyptic number.

20521020722 is a deficient number, since it is larger than the sum of its proper divisors (12086727430).

20521020722 is a wasteful number, since it uses less digits than its factorization.

20521020722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287773.

The product of its (nonzero) digits is 1120, while the sum is 23.

The spelling of 20521020722 in words is "twenty billion, five hundred twenty-one million, twenty thousand, seven hundred twenty-two".