20655330 has 16 divisors (see below), whose sum is σ = 49572864. Its totient is φ = 5508080.

The previous prime is 20655329. The next prime is 20655367. The reversal of 20655330 is 3355602.

It is a self number, because there is not a number n which added to its sum of digits gives 20655330.

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, 344226 + ... + 344285.

It is an arithmetic number, because the mean of its divisors is an integer number (3098304).

Almost surely, 2^20655330 is an apocalyptic number.

20655330 is an abundant number, since it is smaller than the sum of its proper divisors (28917534).

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

20655330 is a wasteful number, since it uses less digits than its factorization.

20655330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688521.

The product of its (nonzero) digits is 2700, while the sum is 24.

The square root of 20655330 is about 4544.8135275278. The cubic root of 20655330 is about 274.3746894038.

The spelling of 20655330 in words is "twenty million, six hundred fifty-five thousand, three hundred thirty".