20972832401 has 4 divisors (see below), whose sum is σ = 20974311204. Its totient is φ = 20971353600.

The previous prime is 20972832337. The next prime is 20972832403. The reversal of 20972832401 is 10423827902.

It is a Cunningham number, because it is equal to 144820²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 236544400 + 20736288001 = 15380^2 + 144001^2 .

It is a cyclic number.

It is not a de Polignac number, because 20972832401 - 2⁶ = 20972832337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20972832403) 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, 717920 + ... + 746561.

It is an arithmetic number, because the mean of its divisors is an integer number (5243577801).

Almost surely, 2^20972832401 is an apocalyptic number.

It is an amenable number.

20972832401 is a deficient number, since it is larger than the sum of its proper divisors (1478803).

20972832401 is a wasteful number, since it uses less digits than its factorization.

20972832401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478802.

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 20972832401 in words is "twenty billion, nine hundred seventy-two million, eight hundred thirty-two thousand, four hundred one".