20655900 has 108 divisors (see below), whose sum is σ = 66011400. Its totient is φ = 5400960.

The previous prime is 20655871. The next prime is 20655919. The reversal of 20655900 is 955602.

20655900 is a `hidden beast` number, since 2 + 0 + 655 + 9 + 0 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 52906 + ... + 53294.

Almost surely, 2^20655900 is an apocalyptic number.

20655900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20655900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33005700).

20655900 is an abundant number, since it is smaller than the sum of its proper divisors (45355500).

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

20655900 is a wasteful number, since it uses less digits than its factorization.

20655900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 20655900 is about 4544.8762359387. The cubic root of 20655900 is about 274.3772132421.

The spelling of 20655900 in words is "twenty million, six hundred fifty-five thousand, nine hundred".