20390104 has 64 divisors (see below), whose sum is σ = 45711360. Its totient is φ = 8346240.

The previous prime is 20390081. The next prime is 20390113. The reversal of 20390104 is 40109302.

It is a super-2 number, since 2×20390104² = 831512682261632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160489 + ... + 160615.

It is an arithmetic number, because the mean of its divisors is an integer number (714240).

Almost surely, 2^20390104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20390104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22855680).

20390104 is an abundant number, since it is smaller than the sum of its proper divisors (25321256).

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

20390104 is a wasteful number, since it uses less digits than its factorization.

20390104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 20390104 is about 4515.5402777519. The cubic root of 20390104 is about 273.1952518241.

Adding to 20390104 its reverse (40109302), we get a palindrome (60499406).

The spelling of 20390104 in words is "twenty million, three hundred ninety thousand, one hundred four".