20045532521 has 16 divisors (see below), whose sum is σ = 23088848640. Its totient is φ = 17047411200.

The previous prime is 20045532503. The next prime is 20045532523. The reversal of 20045532521 is 12523554002.

It is a cyclic number.

It is not a de Polignac number, because 20045532521 - 2²⁶ = 19978423657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20045532523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 894785 + ... + 916913.

It is an arithmetic number, because the mean of its divisors is an integer number (1443053040).

Almost surely, 2^20045532521 is an apocalyptic number.

It is an amenable number.

20045532521 is a deficient number, since it is larger than the sum of its proper divisors (3043316119).

20045532521 is a wasteful number, since it uses less digits than its factorization.

20045532521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23144.

The product of its (nonzero) digits is 12000, while the sum is 29.

The spelling of 20045532521 in words is "twenty billion, forty-five million, five hundred thirty-two thousand, five hundred twenty-one".