20638104 has 32 divisors (see below), whose sum is σ = 54312000. Its totient is φ = 6517152.

The previous prime is 20638099. The next prime is 20638109. The reversal of 20638104 is 40183602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20638099) and next prime (20638109).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20638109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22174 + ... + 23085.

It is an arithmetic number, because the mean of its divisors is an integer number (1697250).

Almost surely, 2^20638104 is an apocalyptic number.

20638104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20638104 is an abundant number, since it is smaller than the sum of its proper divisors (33673896).

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

20638104 is a wasteful number, since it uses less digits than its factorization.

20638104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45287 (or 45283 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20638104 is about 4542.9180049831. The cubic root of 20638104 is about 274.2983944411.

The spelling of 20638104 in words is "twenty million, six hundred thirty-eight thousand, one hundred four".