20655290 has 16 divisors (see below), whose sum is σ = 37428480. Its totient is φ = 8206800.

The previous prime is 20655263. The next prime is 20655293. The reversal of 20655290 is 9255602.

It is not an unprimeable number, because it can be changed into a prime (20655293) 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, 5330 + ... + 8349.

It is an arithmetic number, because the mean of its divisors is an integer number (2339280).

Almost surely, 2^20655290 is an apocalyptic number.

20655290 is a deficient number, since it is larger than the sum of its proper divisors (16773190).

20655290 is a wasteful number, since it uses less digits than its factorization.

20655290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13837.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 20655290 is about 4544.8091269051. The cubic root of 20655290 is about 274.3745122906.

The spelling of 20655290 in words is "twenty million, six hundred fifty-five thousand, two hundred ninety".