20011000 has 32 divisors (see below), whose sum is σ = 46828080. Its totient is φ = 8004000.

The previous prime is 20010967. The next prime is 20011001. The reversal of 20011000 is 11002.

It is a Harshad number since it is a multiple of its sum of digits (4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9006 + ... + 11005.

Almost surely, 2^20011000 is an apocalyptic number.

20011000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011000 is an abundant number, since it is smaller than the sum of its proper divisors (26817080).

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

20011000 is a wasteful number, since it uses less digits than its factorization.

20011000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20032 (or 20018 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 4.

The square root of 20011000 is about 4473.3656233311. The cubic root of 20011000 is about 271.4915168618.

Adding to 20011000 its reverse (11002), we get a palindrome (20022002).

The spelling of 20011000 in words is "twenty million, eleven thousand".