20797597 has 4 divisors (see below), whose sum is σ = 20947360. Its totient is φ = 20647836.

The previous prime is 20797591. The next prime is 20797603. The reversal of 20797597 is 79579702.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (20797591) and next prime (20797603).

It is a cyclic number.

It is not a de Polignac number, because 20797597 - 2¹¹ = 20795549 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 (20797591) 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, 74673 + ... + 74950.

It is an arithmetic number, because the mean of its divisors is an integer number (5236840).

Almost surely, 2^20797597 is an apocalyptic number.

It is an amenable number.

20797597 is a deficient number, since it is larger than the sum of its proper divisors (149763).

20797597 is a wasteful number, since it uses less digits than its factorization.

20797597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149762.

The product of its (nonzero) digits is 277830, while the sum is 46.

The square root of 20797597 is about 4560.4382464847. The cubic root of 20797597 is about 275.0031823323.

The spelling of 20797597 in words is "twenty million, seven hundred ninety-seven thousand, five hundred ninety-seven".