20021104 has 20 divisors (see below), whose sum is σ = 41073264. Its totient is φ = 9421568.

The previous prime is 20021093. The next prime is 20021137. The reversal of 20021104 is 40112002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36532 + ... + 37075.

Almost surely, 2^20021104 is an apocalyptic number.

It is an amenable number.

20021104 is an abundant number, since it is smaller than the sum of its proper divisors (21052160).

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

20021104 is a wasteful number, since it uses less digits than its factorization.

20021104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73632 (or 73626 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 20021104 is about 4474.4948318218. The cubic root of 20021104 is about 271.5372032130.

Adding to 20021104 its reverse (40112002), we get a palindrome (60133106).

The spelling of 20021104 in words is "twenty million, twenty-one thousand, one hundred four".