20873216 has 96 divisors (see below), whose sum is σ = 52296930. Its totient is φ = 8257536.

The previous prime is 20873207. The next prime is 20873221. The reversal of 20873216 is 61237802.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20070400 + 802816 = 4480^2 + 896^2 .

It is a super-2 number, since 2×20873216² = 871382292365312, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1605626 + ... + 1605638.

Almost surely, 2^20873216 is an apocalyptic number.

20873216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20873216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26148465).

20873216 is an abundant number, since it is smaller than the sum of its proper divisors (31423714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20873216 is an frugal number, since it uses more digits than its factorization.

20873216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57 (or 22 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20873216 is about 4568.7214841791. The cubic root of 20873216 is about 275.3360783665.

The spelling of 20873216 in words is "twenty million, eight hundred seventy-three thousand, two hundred sixteen".