20018604 has 48 divisors (see below), whose sum is σ = 47980800. Its totient is φ = 6494400.

The previous prime is 20018587. The next prime is 20018617. The reversal of 20018604 is 40681002.

20018604 is nontrivially palindromic in base 11.

It is a super-2 number, since 2×20018604² = 801489012217632, which contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 100497 + ... + 100695.

It is an arithmetic number, because the mean of its divisors is an integer number (999600).

Almost surely, 2^20018604 is an apocalyptic number.

It is an amenable number.

20018604 is an abundant number, since it is smaller than the sum of its proper divisors (27962196).

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

20018604 is a wasteful number, since it uses less digits than its factorization.

20018604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 20018604 is about 4474.2154619553. The cubic root of 20018604 is about 271.5259006184.

Adding to 20018604 its reverse (40681002), we get a palindrome (60699606).

The spelling of 20018604 in words is "twenty million, eighteen thousand, six hundred four".