20561512522 has 8 divisors (see below), whose sum is σ = 30843569700. Its totient is φ = 10280322624.

The previous prime is 20561512519. The next prime is 20561512613. The reversal of 20561512522 is 22521516502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18607960921 + 1953551601 = 136411^2 + 44199^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153897 + ... + 254572.

Almost surely, 2^20561512522 is an apocalyptic number.

20561512522 is a deficient number, since it is larger than the sum of its proper divisors (10282057178).

20561512522 is a wasteful number, since it uses less digits than its factorization.

20561512522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433640.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 20561512522 in words is "twenty billion, five hundred sixty-one million, five hundred twelve thousand, five hundred twenty-two".