20641100 has 18 divisors (see below), whose sum is σ = 44791404. Its totient is φ = 8256400.

The previous prime is 20641099. The next prime is 20641109. The reversal of 20641100 is 114602.

It is not an unprimeable number, because it can be changed into a prime (20641109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103106 + ... + 103305.

Almost surely, 2^20641100 is an apocalyptic number.

20641100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20641100 is an abundant number, since it is smaller than the sum of its proper divisors (24150304).

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

20641100 is a wasteful number, since it uses less digits than its factorization.

20641100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206425 (or 206418 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 20641100 is about 4543.2477370269. The cubic root of 20641100 is about 274.3116669495.

Adding to 20641100 its reverse (114602), we get a palindrome (20755702).

The spelling of 20641100 in words is "twenty million, six hundred forty-one thousand, one hundred".