20009140 has 12 divisors (see below), whose sum is σ = 42019236. Its totient is φ = 8003648.

The previous prime is 20009137. The next prime is 20009173. The reversal of 20009140 is 4190002.

It can be written as a sum of positive squares in 2 ways, for example, as 10010896 + 9998244 = 3164^2 + 3162^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500209 + ... + 500248.

It is an arithmetic number, because the mean of its divisors is an integer number (3501603).

Almost surely, 2^20009140 is an apocalyptic number.

20009140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20009140 is an abundant number, since it is smaller than the sum of its proper divisors (22010096).

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

20009140 is a wasteful number, since it uses less digits than its factorization.

20009140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000466 (or 1000464 counting only the distinct ones).

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

The square root of 20009140 is about 4473.1577213418. The cubic root of 20009140 is about 271.4831049905.

Adding to 20009140 its reverse (4190002), we get a palindrome (24199142).

The spelling of 20009140 in words is "twenty million, nine thousand, one hundred forty".