20015145553 has 8 divisors (see below), whose sum is σ = 21556976168. Its totient is φ = 18473629824.

The previous prime is 20015145541. The next prime is 20015145587. The reversal of 20015145553 is 35554151002.

It can be written as a sum of positive squares in 4 ways, for example, as 535824 + 20014609729 = 732^2 + 141473^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-20015145553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20015145853) 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, 62725 + ... + 209677.

It is an arithmetic number, because the mean of its divisors is an integer number (2694622021).

Almost surely, 2^20015145553 is an apocalyptic number.

It is an amenable number.

20015145553 is a deficient number, since it is larger than the sum of its proper divisors (1541830615).

20015145553 is a wasteful number, since it uses less digits than its factorization.

20015145553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157443.

The product of its (nonzero) digits is 15000, while the sum is 31.

Adding to 20015145553 its reverse (35554151002), we get a palindrome (55569296555).

The spelling of 20015145553 in words is "twenty billion, fifteen million, one hundred forty-five thousand, five hundred fifty-three".