20002045521 has 16 divisors (see below), whose sum is σ = 28635907968. Its totient is φ = 12373536000.

The previous prime is 20002045517. The next prime is 20002045523. The reversal of 20002045521 is 12554020002.

It is a happy number.

It is not a de Polignac number, because 20002045521 - 2² = 20002045517 is a prime.

It is a super-2 number, since 2×20002045521² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20002045523) 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, 2758330 + ... + 2765571.

It is an arithmetic number, because the mean of its divisors is an integer number (1789744248).

Almost surely, 2^20002045521 is an apocalyptic number.

It is an amenable number.

20002045521 is a deficient number, since it is larger than the sum of its proper divisors (8633862447).

20002045521 is a wasteful number, since it uses less digits than its factorization.

20002045521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5523992.

The product of its (nonzero) digits is 800, while the sum is 21.

Adding to 20002045521 its reverse (12554020002), we get a palindrome (32556065523).

The spelling of 20002045521 in words is "twenty billion, two million, forty-five thousand, five hundred twenty-one".