20021255 has 8 divisors (see below), whose sum is σ = 24675072. Its totient is φ = 15583968.

The previous prime is 20021251. The next prime is 20021263. The reversal of 20021255 is 55212002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20021255 - 2² = 20021251 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021251) 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, 53927 + ... + 54296.

It is an arithmetic number, because the mean of its divisors is an integer number (3084384).

Almost surely, 2^20021255 is an apocalyptic number.

20021255 is a deficient number, since it is larger than the sum of its proper divisors (4653817).

20021255 is a wasteful number, since it uses less digits than its factorization.

20021255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108265.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 20021255 is about 4474.5117052031. The cubic root of 20021255 is about 271.5378858596.

Adding to 20021255 its reverse (55212002), we get a palindrome (75233257).

The spelling of 20021255 in words is "twenty million, twenty-one thousand, two hundred fifty-five".