20655740 has 24 divisors (see below), whose sum is σ = 49574112. Its totient is φ = 7081920.

The previous prime is 20655737. The next prime is 20655749. The reversal of 20655740 is 4755602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73631 + ... + 73910.

It is an arithmetic number, because the mean of its divisors is an integer number (2065588).

Almost surely, 2^20655740 is an apocalyptic number.

20655740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20655740 is an abundant number, since it is smaller than the sum of its proper divisors (28918372).

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

20655740 is a wasteful number, since it uses less digits than its factorization.

20655740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147557 (or 147555 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 20655740 is about 4544.8586336651. The cubic root of 20655740 is about 274.3765048009.

The spelling of 20655740 in words is "twenty million, six hundred fifty-five thousand, seven hundred forty".