20797357 has 4 divisors (see below), whose sum is σ = 23768416. Its totient is φ = 17826300.

The previous prime is 20797351. The next prime is 20797363. The reversal of 20797357 is 75379702.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75379702 = 2 ⋅37689851.

It is an interprime number because it is at equal distance from previous prime (20797351) and next prime (20797363).

It is a cyclic number.

It is not a de Polignac number, because 20797357 - 2³ = 20797349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20797351) 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, 1485519 + ... + 1485532.

It is an arithmetic number, because the mean of its divisors is an integer number (5942104).

Almost surely, 2^20797357 is an apocalyptic number.

It is an amenable number.

20797357 is a deficient number, since it is larger than the sum of its proper divisors (2971059).

20797357 is an equidigital number, since it uses as much as digits as its factorization.

20797357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971058.

The product of its (nonzero) digits is 92610, while the sum is 40.

The square root of 20797357 is about 4560.4119331481. The cubic root of 20797357 is about 275.0021245015.

The spelling of 20797357 in words is "twenty million, seven hundred ninety-seven thousand, three hundred fifty-seven".