20399726 has 8 divisors (see below), whose sum is σ = 30632160. Its totient is φ = 10189008.

The previous prime is 20399723. The next prime is 20399737. The reversal of 20399726 is 62799302.

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

It is a super-2 number, since 2×20399726² = 832297641750152, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20399726.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20399723) 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, 2831 + ... + 6986.

It is an arithmetic number, because the mean of its divisors is an integer number (3829020).

Almost surely, 2^20399726 is an apocalyptic number.

20399726 is a deficient number, since it is larger than the sum of its proper divisors (10232434).

20399726 is a wasteful number, since it uses less digits than its factorization.

20399726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10858.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 20399726 is about 4516.6055838428. The cubic root of 20399726 is about 273.2382182771.

The spelling of 20399726 in words is "twenty million, three hundred ninety-nine thousand, seven hundred twenty-six".