20724334525 has 24 divisors (see below), whose sum is σ = 26594670600. Its totient is φ = 16001529600.

The previous prime is 20724334523. The next prime is 20724334597. The reversal of 20724334525 is 52543342702.

It can be written as a sum of positive squares in 12 ways, for example, as 14498808921 + 6225525604 = 120411^2 + 78902^2 .

It is not a de Polignac number, because 20724334525 - 2¹ = 20724334523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20724334523) 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, 2911671 + ... + 2918779.

It is an arithmetic number, because the mean of its divisors is an integer number (1108111275).

Almost surely, 2^20724334525 is an apocalyptic number.

20724334525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20724334525 is a deficient number, since it is larger than the sum of its proper divisors (5870336075).

20724334525 is a wasteful number, since it uses less digits than its factorization.

20724334525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11169 (or 11164 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 37.

The spelling of 20724334525 in words is "twenty billion, seven hundred twenty-four million, three hundred thirty-four thousand, five hundred twenty-five".