20201000 has 32 divisors (see below), whose sum is σ = 47272680. Its totient is φ = 8080000.

The previous prime is 20200993. The next prime is 20201021. The reversal of 20201000 is 10202.

It can be written as a sum of positive squares in 4 ways, for example, as 682276 + 19518724 = 826^2 + 4418^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9101 + ... + 11100.

Almost surely, 2^20201000 is an apocalyptic number.

20201000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20201000 is an abundant number, since it is smaller than the sum of its proper divisors (27071680).

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

20201000 is a wasteful number, since it uses less digits than its factorization.

20201000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20222 (or 20208 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 20201000 is about 4494.5522580119. The cubic root of 20201000 is about 272.3480622010.

Adding to 20201000 its reverse (10202), we get a palindrome (20211202).

The spelling of 20201000 in words is "twenty million, two hundred one thousand".