20749317492 has 36 divisors (see below), whose sum is σ = 48620101376. Its totient is φ = 6887272560.

The previous prime is 20749317467. The next prime is 20749317509. The reversal of 20749317492 is 29471394702.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 670317 + ... + 700587.

Almost surely, 2^20749317492 is an apocalyptic number.

It is an amenable number.

20749317492 is an abundant number, since it is smaller than the sum of its proper divisors (27870783884).

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

20749317492 is a wasteful number, since it uses less digits than its factorization.

20749317492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30756 (or 30515 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 48.

The spelling of 20749317492 in words is "twenty billion, seven hundred forty-nine million, three hundred seventeen thousand, four hundred ninety-two".