20280797 has 4 divisors (see below), whose sum is σ = 20291040. Its totient is φ = 20270556.

The previous prime is 20280791. The next prime is 20280811. The reversal of 20280797 is 79708202.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20280797 - 2⁴ = 20280781 is a prime.

It is a super-2 number, since 2×20280797² = 822621453910418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20280791) 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, 1097 + ... + 6462.

It is an arithmetic number, because the mean of its divisors is an integer number (5072760).

Almost surely, 2^20280797 is an apocalyptic number.

It is an amenable number.

20280797 is a deficient number, since it is larger than the sum of its proper divisors (10243).

20280797 is an equidigital number, since it uses as much as digits as its factorization.

20280797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10242.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 20280797 is about 4503.4205888413. The cubic root of 20280797 is about 272.7061963746.

Adding to 20280797 its reverse (79708202), we get a palindrome (99988999).

The spelling of 20280797 in words is "twenty million, two hundred eighty thousand, seven hundred ninety-seven".