20281197 has 4 divisors (see below), whose sum is σ = 27041600. Its totient is φ = 13520796.

The previous prime is 20281169. The next prime is 20281199. The reversal of 20281197 is 79118202.

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 not a de Polignac number, because 20281197 - 2⁸ = 20280941 is a prime.

It is a super-2 number, since 2×20281197² = 822653903505618, 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 (20281199) 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, 3380197 + ... + 3380202.

It is an arithmetic number, because the mean of its divisors is an integer number (6760400).

Almost surely, 2^20281197 is an apocalyptic number.

It is an amenable number.

20281197 is a deficient number, since it is larger than the sum of its proper divisors (6760403).

20281197 is an equidigital number, since it uses as much as digits as its factorization.

20281197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6760402.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 20281197 is about 4503.4649993089. The cubic root of 20281197 is about 272.7079892325.

Adding to 20281197 its reverse (79118202), we get a palindrome (99399399).

The spelling of 20281197 in words is "twenty million, two hundred eighty-one thousand, one hundred ninety-seven".