20749906324 has 36 divisors (see below), whose sum is σ = 42459822804. Its totient is φ = 8846724096.

The previous prime is 20749906321. The next prime is 20749906367. The reversal of 20749906324 is 42360994702.

It can be written as a sum of positive squares in 2 ways, for example, as 2117656324 + 18632250000 = 46018^2 + 136500^2 .

It is a super-2 number, since 2×20749906324² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20749906321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 236439 + ... + 312094.

Almost surely, 2^20749906324 is an apocalyptic number.

It is an amenable number.

20749906324 is an abundant number, since it is smaller than the sum of its proper divisors (21709916480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20749906324 is a wasteful number, since it uses less digits than its factorization.

20749906324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548744 (or 548735 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 20749906324 in words is "twenty billion, seven hundred forty-nine million, nine hundred six thousand, three hundred twenty-four".