20157299 has 4 divisors (see below), whose sum is σ = 20166336. Its totient is φ = 20148264.

The previous prime is 20157287. The next prime is 20157301. The reversal of 20157299 is 99275102.

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, and also an emirpimes, since its reverse is a distinct semiprime: 99275102 = 2 ⋅49637551.

It is a cyclic number.

It is not a de Polignac number, because 20157299 - 2⁴ = 20157283 is a prime.

It is a super-4 number, since 4×20157299⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20157209) 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, 1502 + ... + 6524.

It is an arithmetic number, because the mean of its divisors is an integer number (5041584).

Almost surely, 2^20157299 is an apocalyptic number.

20157299 is a deficient number, since it is larger than the sum of its proper divisors (9037).

20157299 is an equidigital number, since it uses as much as digits as its factorization.

20157299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9036.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 20157299 is about 4489.6880737976. The cubic root of 20157299 is about 272.1515294307.

The spelling of 20157299 in words is "twenty million, one hundred fifty-seven thousand, two hundred ninety-nine".