20325131505 has 24 divisors (see below), whose sum is σ = 40263118272. Its totient is φ = 9291488544.

The previous prime is 20325131503. The next prime is 20325131509. The reversal of 20325131505 is 50513152302.

It is a happy number.

20325131505 is a `hidden beast` number, since 2 + 0 + 3 + 25 + 131 + 505 = 666.

It is not a de Polignac number, because 20325131505 - 2¹ = 20325131503 is a prime.

It is a super-2 number, since 2×20325131505² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20325131501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32261799 + ... + 32262428.

It is an arithmetic number, because the mean of its divisors is an integer number (1677629928).

Almost surely, 2^20325131505 is an apocalyptic number.

It is an amenable number.

20325131505 is a deficient number, since it is larger than the sum of its proper divisors (19937986767).

20325131505 is a wasteful number, since it uses less digits than its factorization.

20325131505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64524245 (or 64524242 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

Adding to 20325131505 its reverse (50513152302), we get a palindrome (70838283807).

The spelling of 20325131505 in words is "twenty billion, three hundred twenty-five million, one hundred thirty-one thousand, five hundred five".