20446855 has 16 divisors (see below), whose sum is σ = 28826784. Its totient is φ = 13726080.

The previous prime is 20446849. The next prime is 20446861. The reversal of 20446855 is 55864402.

20446855 = 473² + 474² + ... + 550².

It is an interprime number because it is at equal distance from previous prime (20446849) and next prime (20446861).

It is not a de Polignac number, because 20446855 - 2³ = 20446847 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20446855.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13584 + ... + 15013.

It is an arithmetic number, because the mean of its divisors is an integer number (1801674).

Almost surely, 2^20446855 is an apocalyptic number.

20446855 is a deficient number, since it is larger than the sum of its proper divisors (8379929).

20446855 is a wasteful number, since it uses less digits than its factorization.

20446855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28626.

The product of its (nonzero) digits is 38400, while the sum is 34.

The square root of 20446855 is about 4521.8198769964. The cubic root of 20446855 is about 273.4484750207.

The spelling of 20446855 in words is "twenty million, four hundred forty-six thousand, eight hundred fifty-five".