20380104 has 48 divisors (see below), whose sum is σ = 55910400. Its totient is φ = 6705504.

The previous prime is 20380097. The next prime is 20380111. The reversal of 20380104 is 40108302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20380097) and next prime (20380111).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3897 + ... + 7479.

It is an arithmetic number, because the mean of its divisors is an integer number (1164800).

Almost surely, 2^20380104 is an apocalyptic number.

20380104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20380104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27955200).

20380104 is an abundant number, since it is smaller than the sum of its proper divisors (35530296).

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

20380104 is a wasteful number, since it uses less digits than its factorization.

20380104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3674 (or 3667 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20380104 is about 4514.4328547449. The cubic root of 20380104 is about 273.1505831088.

Adding to 20380104 its reverse (40108302), we get a palindrome (60488406).

The spelling of 20380104 in words is "twenty million, three hundred eighty thousand, one hundred four".