20502542201 has 12 divisors (see below), whose sum is σ = 21068976420. Its totient is φ = 19950809760.

The previous prime is 20502542183. The next prime is 20502542209. The reversal of 20502542201 is 10224520502.

It can be written as a sum of positive squares in 2 ways, for example, as 2237290000 + 18265252201 = 47300^2 + 135149^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20502542201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20502542209) 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, 476771 + ... + 517991.

It is an arithmetic number, because the mean of its divisors is an integer number (1755748035).

Almost surely, 2^20502542201 is an apocalyptic number.

It is an amenable number.

20502542201 is a deficient number, since it is larger than the sum of its proper divisors (566434219).

20502542201 is an equidigital number, since it uses as much as digits as its factorization.

20502542201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41576 (or 41533 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The spelling of 20502542201 in words is "twenty billion, five hundred two million, five hundred forty-two thousand, two hundred one".