20501142401 has 6 divisors (see below), whose sum is σ = 21778030470. Its totient is φ = 19295192576.

The previous prime is 20501142397. The next prime is 20501142419. The reversal of 20501142401 is 10424110502.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 12409960000 + 8091182401 = 111400^2 + 89951^2 .

It is not a de Polignac number, because 20501142401 - 2² = 20501142397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20501142451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35468816 + ... + 35469393.

It is an arithmetic number, because the mean of its divisors is an integer number (3629671745).

Almost surely, 2^20501142401 is an apocalyptic number.

It is an amenable number.

20501142401 is a deficient number, since it is larger than the sum of its proper divisors (1276888069).

20501142401 is an equidigital number, since it uses as much as digits as its factorization.

20501142401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70938243 (or 70938226 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 20501142401 its reverse (10424110502), we get a palindrome (30925252903).

The spelling of 20501142401 in words is "twenty billion, five hundred one million, one hundred forty-two thousand, four hundred one".