20001940 has 24 divisors (see below), whose sum is σ = 48004992. Its totient is φ = 6857760.

The previous prime is 20001937. The next prime is 20001959. The reversal of 20001940 is 4910002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71296 + ... + 71575.

It is an arithmetic number, because the mean of its divisors is an integer number (2000208).

Almost surely, 2^20001940 is an apocalyptic number.

20001940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001940 is an abundant number, since it is smaller than the sum of its proper divisors (28003052).

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

20001940 is a wasteful number, since it uses less digits than its factorization.

20001940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142887 (or 142885 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20001940 is about 4472.3528483339. The cubic root of 20001940 is about 271.4505379927.

Adding to 20001940 its reverse (4910002), we get a palindrome (24911942).

The spelling of 20001940 in words is "twenty million, one thousand, nine hundred forty".