20157799 has 4 divisors (see below), whose sum is σ = 20167336. Its totient is φ = 20148264.

The previous prime is 20157791. The next prime is 20157811. The reversal of 20157799 is 99775102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20157799 - 2³ = 20157791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20157791) 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, 24 + ... + 6349.

It is an arithmetic number, because the mean of its divisors is an integer number (5041834).

Almost surely, 2^20157799 is an apocalyptic number.

20157799 is a deficient number, since it is larger than the sum of its proper divisors (9537).

20157799 is an equidigital number, since it uses as much as digits as its factorization.

20157799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9536.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 20157799 is about 4489.7437566079. The cubic root of 20157799 is about 272.1537796436.

The spelling of 20157799 in words is "twenty million, one hundred fifty-seven thousand, seven hundred ninety-nine".