20259997 has 4 divisors (see below), whose sum is σ = 20456800. Its totient is φ = 20063196.

The previous prime is 20259983. The next prime is 20260001. The reversal of 20259997 is 79995202.

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 20259997 - 2¹¹ = 20257949 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 (20259917) 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, 98247 + ... + 98452.

It is an arithmetic number, because the mean of its divisors is an integer number (5114200).

Almost surely, 2^20259997 is an apocalyptic number.

It is an amenable number.

20259997 is a deficient number, since it is larger than the sum of its proper divisors (196803).

20259997 is a wasteful number, since it uses less digits than its factorization.

20259997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196802.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 20259997 is about 4501.1106407197. The cubic root of 20259997 is about 272.6129352607.

The spelling of 20259997 in words is "twenty million, two hundred fifty-nine thousand, nine hundred ninety-seven".