20725340 has 12 divisors (see below), whose sum is σ = 43523256. Its totient is φ = 8290128.

The previous prime is 20725339. The next prime is 20725361. The reversal of 20725340 is 4352702.

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, 518114 + ... + 518153.

It is an arithmetic number, because the mean of its divisors is an integer number (3626938).

Almost surely, 2^20725340 is an apocalyptic number.

20725340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20725340 is an abundant number, since it is smaller than the sum of its proper divisors (22797916).

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

20725340 is a wasteful number, since it uses less digits than its factorization.

20725340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036276 (or 1036274 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 20725340 is about 4552.5091982334. The cubic root of 20725340 is about 274.6843320034.

The spelling of 20725340 in words is "twenty million, seven hundred twenty-five thousand, three hundred forty".