20621104 has 20 divisors (see below), whose sum is σ = 45661264. Its totient is φ = 8837568.

The previous prime is 20621089. The next prime is 20621131. The reversal of 20621104 is 40112602.

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 91947 + ... + 92170.

Almost surely, 2^20621104 is an apocalyptic number.

It is an amenable number.

20621104 is an abundant number, since it is smaller than the sum of its proper divisors (25040160).

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

20621104 is a wasteful number, since it uses less digits than its factorization.

20621104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184132 (or 184126 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 20621104 is about 4541.0465754053. The cubic root of 20621104 is about 274.2230588120.

Adding to 20621104 its reverse (40112602), we get a palindrome (60733706).

The spelling of 20621104 in words is "twenty million, six hundred twenty-one thousand, one hundred four".