20525918401 has 4 divisors (see below), whose sum is σ = 20598448432. Its totient is φ = 20453388372.

The previous prime is 20525918393. The next prime is 20525918407. The reversal of 20525918401 is 10481952502.

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 not a de Polignac number, because 20525918401 - 2³ = 20525918393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20525918407) 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, 36264591 + ... + 36265156.

It is an arithmetic number, because the mean of its divisors is an integer number (5149612108).

Almost surely, 2^20525918401 is an apocalyptic number.

It is an amenable number.

20525918401 is a deficient number, since it is larger than the sum of its proper divisors (72530031).

20525918401 is an equidigital number, since it uses as much as digits as its factorization.

20525918401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72530030.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 20525918401 in words is "twenty billion, five hundred twenty-five million, nine hundred eighteen thousand, four hundred one".