20215144200531 has 64 divisors (see below), whose sum is σ = 33499519211520. Its totient is φ = 10577548892160.

The previous prime is 20215144200529. The next prime is 20215144200547. The reversal of 20215144200531 is 13500244151202.

It is not a de Polignac number, because 20215144200531 - 2¹ = 20215144200529 is a prime.

It is a super-2 number, since 2×20215144200531² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20215144200551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 299401066 + ... + 299468576.

It is an arithmetic number, because the mean of its divisors is an integer number (523429987680).

Almost surely, 2^{20215144200531} is an apocalyptic number.

20215144200531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20215144200531 is a deficient number, since it is larger than the sum of its proper divisors (13284375010989).

20215144200531 is a wasteful number, since it uses less digits than its factorization.

20215144200531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90244.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 20215144200531 its reverse (13500244151202), we get a palindrome (33715388351733).

The spelling of 20215144200531 in words is "twenty trillion, two hundred fifteen billion, one hundred forty-four million, two hundred thousand, five hundred thirty-one".