20819196 has 18 divisors (see below), whose sum is σ = 52626392. Its totient is φ = 6939720.

The previous prime is 20819173. The next prime is 20819213. The reversal of 20819196 is 69191802.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 578311 = 20819196 / (2 + 0 + 8 + 1 + 9 + 1 + 9 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 20819196.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 289120 + ... + 289191.

Almost surely, 2^20819196 is an apocalyptic number.

It is an amenable number.

20819196 is an abundant number, since it is smaller than the sum of its proper divisors (31807196).

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

20819196 is a wasteful number, since it uses less digits than its factorization.

20819196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578321 (or 578316 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 20819196 is about 4562.8057157850. The cubic root of 20819196 is about 275.0983493957.

The spelling of 20819196 in words is "twenty million, eight hundred nineteen thousand, one hundred ninety-six".