20447874401 has 4 divisors (see below), whose sum is σ = 20735872704. Its totient is φ = 20159876100.

The previous prime is 20447874353. The next prime is 20447874463. The reversal of 20447874401 is 10447874402.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20447874401 is a prime.

It is a super-2 number, since 2×20447874401² (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 (20447874901) 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, 143999045 + ... + 143999186.

It is an arithmetic number, because the mean of its divisors is an integer number (5183968176).

Almost surely, 2^20447874401 is an apocalyptic number.

It is an amenable number.

20447874401 is a deficient number, since it is larger than the sum of its proper divisors (287998303).

20447874401 is an equidigital number, since it uses as much as digits as its factorization.

20447874401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287998302.

The product of its (nonzero) digits is 200704, while the sum is 41.

Subtracting from 20447874401 its reverse (10447874402), we obtain a palindrome (9999999999).

The spelling of 20447874401 in words is "twenty billion, four hundred forty-seven million, eight hundred seventy-four thousand, four hundred one".