20259697 has 4 divisors (see below), whose sum is σ = 20407716. Its totient is φ = 20111680.

The previous prime is 20259671. The next prime is 20259713. The reversal of 20259697 is 79695202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79695202 = 2 ⋅39847601.

It can be written as a sum of positive squares in 2 ways, for example, as 15555136 + 4704561 = 3944^2 + 2169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20259697 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20259607) 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, 73804 + ... + 74077.

It is an arithmetic number, because the mean of its divisors is an integer number (5101929).

Almost surely, 2^20259697 is an apocalyptic number.

It is an amenable number.

20259697 is a deficient number, since it is larger than the sum of its proper divisors (148019).

20259697 is a wasteful number, since it uses less digits than its factorization.

20259697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148018.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 20259697 is about 4501.0773154879. The cubic root of 20259697 is about 272.6115896816.

The spelling of 20259697 in words is "twenty million, two hundred fifty-nine thousand, six hundred ninety-seven".