20044006521 has 64 divisors (see below), whose sum is σ = 34058797056. Its totient is φ = 10183924800.

The previous prime is 20044006517. The next prime is 20044006523. The reversal of 20044006521 is 12560044002.

It is not a de Polignac number, because 20044006521 - 2² = 20044006517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20044006491 and 20044006500.

It is not an unprimeable number, because it can be changed into a prime (20044006523) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2078116 + ... + 2087738.

It is an arithmetic number, because the mean of its divisors is an integer number (532168704).

Almost surely, 2^20044006521 is an apocalyptic number.

20044006521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20044006521 is a deficient number, since it is larger than the sum of its proper divisors (14014790535).

20044006521 is a wasteful number, since it uses less digits than its factorization.

20044006521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9842.

The product of its (nonzero) digits is 1920, while the sum is 24.

The spelling of 20044006521 in words is "twenty billion, forty-four million, six thousand, five hundred twenty-one".