20157393 has 8 divisors (see below), whose sum is σ = 28457568. Its totient is φ = 12647744.

The previous prime is 20157391. The next prime is 20157413. The reversal of 20157393 is 39375102.

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 20157393 - 2¹ = 20157391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20157393.

It is not an unprimeable number, because it can be changed into a prime (20157391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197571 + ... + 197672.

It is an arithmetic number, because the mean of its divisors is an integer number (3557196).

Almost surely, 2^20157393 is an apocalyptic number.

It is an amenable number.

20157393 is a deficient number, since it is larger than the sum of its proper divisors (8300175).

20157393 is a wasteful number, since it uses less digits than its factorization.

20157393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395263.

The product of its (nonzero) digits is 5670, while the sum is 30.

The square root of 20157393 is about 4489.6985422186. The cubic root of 20157393 is about 272.1519524736.

The spelling of 20157393 in words is "twenty million, one hundred fifty-seven thousand, three hundred ninety-three".