20813740 has 24 divisors (see below), whose sum is σ = 46010160. Its totient is φ = 7887168.

The previous prime is 20813731. The next prime is 20813753. The reversal of 20813740 is 4731802.

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, 27007 + ... + 27766.

It is an arithmetic number, because the mean of its divisors is an integer number (1917090).

Almost surely, 2^20813740 is an apocalyptic number.

20813740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20813740 is an abundant number, since it is smaller than the sum of its proper divisors (25196420).

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

20813740 is a wasteful number, since it uses less digits than its factorization.

20813740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54801 (or 54799 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20813740 is about 4562.2077988623. The cubic root of 20813740 is about 275.0743160032.

The spelling of 20813740 in words is "twenty million, eight hundred thirteen thousand, seven hundred forty".