20828855 has 8 divisors (see below), whose sum is σ = 25032192. Its totient is φ = 16638048.

The previous prime is 20828851. The next prime is 20828867. The reversal of 20828855 is 55882802.

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 20828855 - 2² = 20828851 is a prime.

It is a super-2 number, since 2×20828855² = 867682401222050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20828851) 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, 1034 + ... + 6536.

It is an arithmetic number, because the mean of its divisors is an integer number (3129024).

Almost surely, 2^20828855 is an apocalyptic number.

20828855 is a deficient number, since it is larger than the sum of its proper divisors (4203337).

20828855 is an equidigital number, since it uses as much as digits as its factorization.

20828855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6265.

The product of its (nonzero) digits is 51200, while the sum is 38.

The square root of 20828855 is about 4563.8640426726. The cubic root of 20828855 is about 275.1408864872.

The spelling of 20828855 in words is "twenty million, eight hundred twenty-eight thousand, eight hundred fifty-five".