20813594441 has 4 divisors (see below), whose sum is σ = 21909046800. Its totient is φ = 19718142084.

The previous prime is 20813594429. The next prime is 20813594443. The reversal of 20813594441 is 14449531802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14449531802 = 2 ⋅7224765901.

It is a cyclic number.

It is not a de Polignac number, because 20813594441 - 2²⁶ = 20746485577 is a prime.

It is a super-2 number, since 2×20813594441² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20813594443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 547726151 + ... + 547726188.

It is an arithmetic number, because the mean of its divisors is an integer number (5477261700).

Almost surely, 2^20813594441 is an apocalyptic number.

It is an amenable number.

20813594441 is a deficient number, since it is larger than the sum of its proper divisors (1095452359).

20813594441 is a wasteful number, since it uses less digits than its factorization.

20813594441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095452358.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 20813594441 in words is "twenty billion, eight hundred thirteen million, five hundred ninety-four thousand, four hundred forty-one".