20275997 has 4 divisors (see below), whose sum is σ = 23172576. Its totient is φ = 17379420.

The previous prime is 20275991. The next prime is 20276023. The reversal of 20275997 is 79957202.

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 a cyclic number.

It is not a de Polignac number, because 20275997 - 2²⁰ = 19227421 is a prime.

It is a super-2 number, since 2×20275997² = 822232108688018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20275991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1448279 + ... + 1448292.

It is an arithmetic number, because the mean of its divisors is an integer number (5793144).

Almost surely, 2^20275997 is an apocalyptic number.

It is an amenable number.

20275997 is a deficient number, since it is larger than the sum of its proper divisors (2896579).

20275997 is an equidigital number, since it uses as much as digits as its factorization.

20275997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2896578.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 20275997 is about 4502.8876290665. The cubic root of 20275997 is about 272.6846802408.

The spelling of 20275997 in words is "twenty million, two hundred seventy-five thousand, nine hundred ninety-seven".