20686104 has 56 divisors (see below), whose sum is σ = 58169460. Its totient is φ = 6893424.

The previous prime is 20686097. The next prime is 20686109. The reversal of 20686104 is 40168602.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686109) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 4059 + ... + 7605.

Almost surely, 2^20686104 is an apocalyptic number.

20686104 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 20686104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29084730).

20686104 is an abundant number, since it is smaller than the sum of its proper divisors (37483356).

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

20686104 is an equidigital number, since it uses as much as digits as its factorization.

20686104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3571 (or 3552 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20686104 is about 4548.1978848770. The cubic root of 20686104 is about 274.5108837394.

The spelling of 20686104 in words is "twenty million, six hundred eighty-six thousand, one hundred four".