20431757349 has 12 divisors (see below), whose sum is σ = 29515196256. Its totient is φ = 13619944872.

The previous prime is 20431757347. The next prime is 20431757441. The reversal of 20431757349 is 94375713402.

20431757349 is a `hidden beast` number, since 2 + 0 + 4 + 31 + 7 + 573 + 49 = 666.

It is not a de Polignac number, because 20431757349 - 2¹ = 20431757347 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431757347) 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, 9714 + ... + 202380.

It is an arithmetic number, because the mean of its divisors is an integer number (2459599688).

Almost surely, 2^20431757349 is an apocalyptic number.

It is an amenable number.

20431757349 is a deficient number, since it is larger than the sum of its proper divisors (9083438907).

20431757349 is a wasteful number, since it uses less digits than its factorization.

20431757349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204456 (or 204453 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The spelling of 20431757349 in words is "twenty billion, four hundred thirty-one million, seven hundred fifty-seven thousand, three hundred forty-nine".