20200491 has 6 divisors (see below), whose sum is σ = 29178500. Its totient is φ = 13466988.

The previous prime is 20200441. The next prime is 20200511. The reversal of 20200491 is 19400202.

It is not a de Polignac number, because 20200491 - 2¹³ = 20192299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20200441) 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, 1122241 + ... + 1122258.

Almost surely, 2^20200491 is an apocalyptic number.

20200491 is a deficient number, since it is larger than the sum of its proper divisors (8978009).

20200491 is a wasteful number, since it uses less digits than its factorization.

20200491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2244505 (or 2244502 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20200491 is about 4494.4956335500. The cubic root of 20200491 is about 272.3457747511.

Adding to 20200491 its reverse (19400202), we get a palindrome (39600693).

The spelling of 20200491 in words is "twenty million, two hundred thousand, four hundred ninety-one".