20259861 has 8 divisors (see below), whose sum is σ = 27072864. Its totient is φ = 13476720.

The previous prime is 20259847. The next prime is 20259881. The reversal of 20259861 is 16895202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20259861 - 2⁶ = 20259797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20259881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5830 + ... + 8631.

It is an arithmetic number, because the mean of its divisors is an integer number (3384108).

Almost surely, 2^20259861 is an apocalyptic number.

It is an amenable number.

20259861 is a deficient number, since it is larger than the sum of its proper divisors (6813003).

20259861 is a wasteful number, since it uses less digits than its factorization.

20259861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14931.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 20259861 is about 4501.0955333119. The cubic root of 20259861 is about 272.6123252665.

The spelling of 20259861 in words is "twenty million, two hundred fifty-nine thousand, eight hundred sixty-one".