20515034401 has 8 divisors (see below), whose sum is σ = 20758036104. Its totient is φ = 20273111040.

The previous prime is 20515034383. The next prime is 20515034411. The reversal of 20515034401 is 10443051502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3066001 + 20511968400 = 1751^2 + 143220^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20515034401 - 2²⁵ = 20481479969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20515034411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231280 + ... + 307441.

It is an arithmetic number, because the mean of its divisors is an integer number (2594754513).

Almost surely, 2^20515034401 is an apocalyptic number.

It is an amenable number.

20515034401 is a deficient number, since it is larger than the sum of its proper divisors (243001703).

20515034401 is a wasteful number, since it uses less digits than its factorization.

20515034401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539171.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 20515034401 its reverse (10443051502), we get a palindrome (30958085903).

The spelling of 20515034401 in words is "twenty billion, five hundred fifteen million, thirty-four thousand, four hundred one".