20001624 has 32 divisors (see below), whose sum is σ = 50172720. Its totient is φ = 6644736.

The previous prime is 20001613. The next prime is 20001659. The reversal of 20001624 is 42610002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6852 + ... + 9324.

Almost surely, 2^20001624 is an apocalyptic number.

20001624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20001624 is an abundant number, since it is smaller than the sum of its proper divisors (30171096).

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

20001624 is a wasteful number, since it uses less digits than its factorization.

20001624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2819 (or 2815 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20001624 is about 4472.3175200337. The cubic root of 20001624 is about 271.4491084843.

Adding to 20001624 its reverse (42610002), we get a palindrome (62611626).

The spelling of 20001624 in words is "twenty million, one thousand, six hundred twenty-four".