20066904 has 96 divisors (see below), whose sum is σ = 63882000. Its totient is φ = 5610240.

The previous prime is 20066899. The next prime is 20066909. The reversal of 20066904 is 40966002.

It is an interprime number because it is at equal distance from previous prime (20066899) and next prime (20066909).

It is a super-2 number, since 2×20066904² = 805361272290432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20066909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9322 + ... + 11270.

Almost surely, 2^20066904 is an apocalyptic number.

20066904 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 20066904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31941000).

20066904 is an abundant number, since it is smaller than the sum of its proper divisors (43815096).

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

20066904 is a wasteful number, since it uses less digits than its factorization.

20066904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1985 (or 1978 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20066904 is about 4479.6098044361. The cubic root of 20066904 is about 271.7441004422.

The spelling of 20066904 in words is "twenty million, sixty-six thousand, nine hundred four".