20801940 has 24 divisors (see below), whose sum is σ = 58245600. Its totient is φ = 5547168.

The previous prime is 20801939. The next prime is 20801971. The reversal of 20801940 is 4910802.

It is a self number, because there is not a number n which added to its sum of digits gives 20801940.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173290 + ... + 173409.

It is an arithmetic number, because the mean of its divisors is an integer number (2426900).

Almost surely, 2^20801940 is an apocalyptic number.

20801940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20801940 is an abundant number, since it is smaller than the sum of its proper divisors (37443660).

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

20801940 is a wasteful number, since it uses less digits than its factorization.

20801940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346711 (or 346709 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 20801940 is about 4560.9143820072. The cubic root of 20801940 is about 275.0223232567.

The spelling of 20801940 in words is "twenty million, eight hundred one thousand, nine hundred forty".