20684196 has 72 divisors (see below), whose sum is σ = 56845880. Its totient is φ = 6303744.

The previous prime is 20684171. The next prime is 20684197. The reversal of 20684196 is 69148602.

It can be written as a sum of positive squares in 4 ways, for example, as 2073600 + 18610596 = 1440^2 + 4314^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20684196.

It is not an unprimeable number, because it can be changed into a prime (20684197) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90210 + ... + 90438.

Almost surely, 2^20684196 is an apocalyptic number.

20684196 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 20684196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28422940).

20684196 is an abundant number, since it is smaller than the sum of its proper divisors (36161684).

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

20684196 is a wasteful number, since it uses less digits than its factorization.

20684196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20684196 is about 4547.9881266336. The cubic root of 20684196 is about 274.5024435667.

The spelling of 20684196 in words is "twenty million, six hundred eighty-four thousand, one hundred ninety-six".