20039418 has 48 divisors (see below), whose sum is σ = 50207040. Its totient is φ = 5658048.

The previous prime is 20039407. The next prime is 20039443. The reversal of 20039418 is 81493002.

It is a junction number, because it is equal to n+sod(n) for n = 20039391 and 20039400.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10321 + ... + 12107.

It is an arithmetic number, because the mean of its divisors is an integer number (1045980).

Almost surely, 2^20039418 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20039418, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25103520).

20039418 is an abundant number, since it is smaller than the sum of its proper divisors (30167622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20039418 is a wasteful number, since it uses less digits than its factorization.

20039418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891 (or 1888 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20039418 is about 4476.5408520419. The cubic root of 20039418 is about 271.6199728213.

The spelling of 20039418 in words is "twenty million, thirty-nine thousand, four hundred eighteen".