20013940 has 12 divisors (see below), whose sum is σ = 42029316. Its totient is φ = 8005568.

The previous prime is 20013937. The next prime is 20013971. The reversal of 20013940 is 4931002.

It can be written as a sum of positive squares in 2 ways, for example, as 9696996 + 10316944 = 3114^2 + 3212^2 .

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, 500329 + ... + 500368.

It is an arithmetic number, because the mean of its divisors is an integer number (3502443).

Almost surely, 2^20013940 is an apocalyptic number.

20013940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20013940 is an abundant number, since it is smaller than the sum of its proper divisors (22015376).

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

20013940 is a wasteful number, since it uses less digits than its factorization.

20013940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000706 (or 1000704 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 20013940 is about 4473.6942228990. The cubic root of 20013940 is about 271.5048119824.

Adding to 20013940 its reverse (4931002), we get a palindrome (24944942).

The spelling of 20013940 in words is "twenty million, thirteen thousand, nine hundred forty".