20431157273 has 4 divisors (see below), whose sum is σ = 21506481360. Its totient is φ = 19355833188.

The previous prime is 20431157261. The next prime is 20431157287. The reversal of 20431157273 is 37275113402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20431157273 - 2¹² = 20431153177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20431157573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537662015 + ... + 537662052.

It is an arithmetic number, because the mean of its divisors is an integer number (5376620340).

Almost surely, 2^20431157273 is an apocalyptic number.

It is an amenable number.

20431157273 is a deficient number, since it is larger than the sum of its proper divisors (1075324087).

20431157273 is a wasteful number, since it uses less digits than its factorization.

20431157273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075324086.

The product of its (nonzero) digits is 35280, while the sum is 35.

The spelling of 20431157273 in words is "twenty billion, four hundred thirty-one million, one hundred fifty-seven thousand, two hundred seventy-three".