20775597 has 4 divisors (see below), whose sum is σ = 27700800. Its totient is φ = 13850396.

The previous prime is 20775593. The next prime is 20775613. The reversal of 20775597 is 79557702.

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.

It is a cyclic number.

It is not a de Polignac number, because 20775597 - 2² = 20775593 is a prime.

It is a super-3 number, since 3×20775597³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775593) 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, 3462597 + ... + 3462602.

It is an arithmetic number, because the mean of its divisors is an integer number (6925200).

Almost surely, 2^20775597 is an apocalyptic number.

It is an amenable number.

20775597 is a deficient number, since it is larger than the sum of its proper divisors (6925203).

20775597 is an equidigital number, since it uses as much as digits as its factorization.

20775597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6925202.

The product of its (nonzero) digits is 154350, while the sum is 42.

The square root of 20775597 is about 4558.0255593842. The cubic root of 20775597 is about 274.9061806683.

The spelling of 20775597 in words is "twenty million, seven hundred seventy-five thousand, five hundred ninety-seven".