20655550 has 12 divisors (see below), whose sum is σ = 38419416. Its totient is φ = 8262200.

The previous prime is 20655529. The next prime is 20655553. The reversal of 20655550 is 5555602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655553) 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, 206506 + ... + 206605.

It is an arithmetic number, because the mean of its divisors is an integer number (3201618).

Almost surely, 2^20655550 is an apocalyptic number.

20655550 is a deficient number, since it is larger than the sum of its proper divisors (17763866).

20655550 is a wasteful number, since it uses less digits than its factorization.

20655550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413123 (or 413118 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 28.

The square root of 20655550 is about 4544.8377308766. The cubic root of 20655550 is about 274.3756635223.

The spelling of 20655550 in words is "twenty million, six hundred fifty-five thousand, five hundred fifty".