20124666 has 64 divisors (see below), whose sum is σ = 47174400. Its totient is φ = 6350400.

The previous prime is 20124661. The next prime is 20124733. The reversal of 20124666 is 66642102.

It is a happy number.

It is a super-2 number, since 2×20124666² = 810004363223112, which contains 22 as substring.

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 (20124661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111096 + ... + 111276.

It is an arithmetic number, because the mean of its divisors is an integer number (737100).

Almost surely, 2^20124666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20124666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23587200).

20124666 is an abundant number, since it is smaller than the sum of its proper divisors (27049734).

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

20124666 is a wasteful number, since it uses less digits than its factorization.

20124666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20124666 is about 4486.0523848925. The cubic root of 20124666 is about 272.0045864999.

Adding to 20124666 its reverse (66642102), we get a palindrome (86766768).

The spelling of 20124666 in words is "twenty million, one hundred twenty-four thousand, six hundred sixty-six".