20504040401 has 16 divisors (see below), whose sum is σ = 22332714768. Its totient is φ = 18711840000.

The previous prime is 20504040379. The next prime is 20504040409. The reversal of 20504040401 is 10404040502.

It can be written as a sum of positive squares in 8 ways, for example, as 4438224400 + 16065816001 = 66620^2 + 126751^2 .

It is a cyclic number.

It is not a de Polignac number, because 20504040401 - 2¹⁸ = 20503778257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20504040409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 909275 + ... + 931551.

It is an arithmetic number, because the mean of its divisors is an integer number (1395794673).

Almost surely, 2^20504040401 is an apocalyptic number.

It is an amenable number.

20504040401 is a deficient number, since it is larger than the sum of its proper divisors (1828674367).

20504040401 is a wasteful number, since it uses less digits than its factorization.

20504040401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23092.

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 20504040401 its reverse (10404040502), we get a palindrome (30908080903).

The spelling of 20504040401 in words is "twenty billion, five hundred four million, forty thousand, four hundred one".