20371567441 has 9 divisors (see below), whose sum is σ = 20770901809. Its totient is φ = 19979776336.

The previous prime is 20371567417. The next prime is 20371567457. The reversal of 20371567441 is 14476517302.

The square root of 20371567441 is 142729.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 388917841 + 19982649600 = 19721^2 + 141360^2 .

It is not a de Polignac number, because 20371567441 - 2⁵ = 20371567409 is a prime.

It is a super-2 number, since 2×20371567441² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20371567394 and 20371567403.

It is not an unprimeable number, because it can be changed into a prime (20371567471) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7563291 + ... + 7565983.

Almost surely, 2^20371567441 is an apocalyptic number.

20371567441 is the 142729-th square number.

20371567441 is the 71365-th centered octagonal number.

It is an amenable number.

20371567441 is a deficient number, since it is larger than the sum of its proper divisors (399334368).

20371567441 is an frugal number, since it uses more digits than its factorization.

20371567441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5492 (or 2746 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 20371567441 in words is "twenty billion, three hundred seventy-one million, five hundred sixty-seven thousand, four hundred forty-one".