20445411021 has 16 divisors (see below), whose sum is σ = 31198876800. Its totient is φ = 11666605248.

The previous prime is 20445411013. The next prime is 20445411043. The reversal of 20445411021 is 12011454402.

It is not a de Polignac number, because 20445411021 - 2³ = 20445411013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20445410982 and 20445411000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20445411011) 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, 671706 + ... + 701483.

It is an arithmetic number, because the mean of its divisors is an integer number (1949929800).

Almost surely, 2^20445411021 is an apocalyptic number.

20445411021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20445411021 is a deficient number, since it is larger than the sum of its proper divisors (10753465779).

20445411021 is a wasteful number, since it uses less digits than its factorization.

20445411021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373908.

The product of its (nonzero) digits is 1280, while the sum is 24.

Adding to 20445411021 its reverse (12011454402), we get a palindrome (32456865423).

The spelling of 20445411021 in words is "twenty billion, four hundred forty-five million, four hundred eleven thousand, twenty-one".