20399734 has 8 divisors (see below), whose sum is σ = 30698928. Its totient is φ = 10166760.

The previous prime is 20399723. The next prime is 20399737. The reversal of 20399734 is 43799302.

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

It is a super-2 number, since 2×20399734² = 832298294541512, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20399693 and 20399702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20399737) 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, 15777 + ... + 17020.

It is an arithmetic number, because the mean of its divisors is an integer number (3837366).

Almost surely, 2^20399734 is an apocalyptic number.

20399734 is a deficient number, since it is larger than the sum of its proper divisors (10299194).

20399734 is a wasteful number, since it uses less digits than its factorization.

20399734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33110.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 20399734 is about 4516.6064694636. The cubic root of 20399734 is about 273.2382539949.

The spelling of 20399734 in words is "twenty million, three hundred ninety-nine thousand, seven hundred thirty-four".