20855469 has 16 divisors (see below), whose sum is σ = 28408320. Its totient is φ = 13606320.

The previous prime is 20855453. The next prime is 20855479. The reversal of 20855469 is 96455802.

It is not a de Polignac number, because 20855469 - 2⁴ = 20855453 is a prime.

It is a super-2 number, since 2×20855469² = 869901174419922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37854 + ... + 38400.

It is an arithmetic number, because the mean of its divisors is an integer number (1775520).

Almost surely, 2^20855469 is an apocalyptic number.

It is an amenable number.

20855469 is a deficient number, since it is larger than the sum of its proper divisors (7552851).

20855469 is a wasteful number, since it uses less digits than its factorization.

20855469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800.

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 20855469 is about 4566.7788429045. The cubic root of 20855469 is about 275.2580233942.

The spelling of 20855469 in words is "twenty million, eight hundred fifty-five thousand, four hundred sixty-nine".