20561370527 has 12 divisors (see below), whose sum is σ = 21515052960. Its totient is φ = 19646153280.

The previous prime is 20561370523. The next prime is 20561370551. The reversal of 20561370527 is 72507316502.

It is not a de Polignac number, because 20561370527 - 2² = 20561370523 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20561370523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59498 + ... + 211335.

It is an arithmetic number, because the mean of its divisors is an integer number (1792921080).

Almost surely, 2^20561370527 is an apocalyptic number.

20561370527 is a deficient number, since it is larger than the sum of its proper divisors (953682433).

20561370527 is an equidigital number, since it uses as much as digits as its factorization.

20561370527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270974 (or 270943 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 38.

The spelling of 20561370527 in words is "twenty billion, five hundred sixty-one million, three hundred seventy thousand, five hundred twenty-seven".