20655198 has 12 divisors (see below), whose sum is σ = 44752968. Its totient is φ = 6885060.

The previous prime is 20655181. The next prime is 20655199. The reversal of 20655198 is 89155602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655199) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 573738 + ... + 573773.

It is an arithmetic number, because the mean of its divisors is an integer number (3729414).

Almost surely, 2^20655198 is an apocalyptic number.

20655198 is an abundant number, since it is smaller than the sum of its proper divisors (24097770).

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

20655198 is a wasteful number, since it uses less digits than its factorization.

20655198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147519 (or 1147516 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 20655198 is about 4544.7990054567. The cubic root of 20655198 is about 274.3741049294.

The spelling of 20655198 in words is "twenty million, six hundred fifty-five thousand, one hundred ninety-eight".