20399858 has 8 divisors (see below), whose sum is σ = 30716928. Its totient is φ = 10160884.

The previous prime is 20399857. The next prime is 20399867. The reversal of 20399858 is 85899302.

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

It is not an unprimeable number, because it can be changed into a prime (20399851) 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, 18866 + ... + 19917.

It is an arithmetic number, because the mean of its divisors is an integer number (3839616).

Almost surely, 2^20399858 is an apocalyptic number.

20399858 is a deficient number, since it is larger than the sum of its proper divisors (10317070).

20399858 is a wasteful number, since it uses less digits than its factorization.

20399858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39048.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 20399858 is about 4516.6201965629. The cubic root of 20399858 is about 273.2388076210.

The spelling of 20399858 in words is "twenty million, three hundred ninety-nine thousand, eight hundred fifty-eight".