20531257193 has 8 divisors (see below), whose sum is σ = 20600822400. Its totient is φ = 20461805280.

The previous prime is 20531257169. The next prime is 20531257247. The reversal of 20531257193 is 39175213502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20531257193 - 2¹⁰ = 20531256169 is a prime.

It is a super-2 number, since 2×20531257193² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20531257093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342908 + ... + 398306.

It is an arithmetic number, because the mean of its divisors is an integer number (2575102800).

Almost surely, 2^20531257193 is an apocalyptic number.

It is an amenable number.

20531257193 is a deficient number, since it is larger than the sum of its proper divisors (69565207).

20531257193 is an equidigital number, since it uses as much as digits as its factorization.

20531257193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56647.

The product of its (nonzero) digits is 56700, while the sum is 38.

The spelling of 20531257193 in words is "twenty billion, five hundred thirty-one million, two hundred fifty-seven thousand, one hundred ninety-three".