20299356 has 96 divisors (see below), whose sum is σ = 65640960. Its totient is φ = 5270400.

The previous prime is 20299339. The next prime is 20299361. The reversal of 20299356 is 65399202.

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 20299356.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7096 + ... + 9536.

It is an arithmetic number, because the mean of its divisors is an integer number (683760).

Almost surely, 2^20299356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20299356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32820480).

20299356 is an abundant number, since it is smaller than the sum of its proper divisors (45341604).

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

20299356 is a wasteful number, since it uses less digits than its factorization.

20299356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2472 (or 2464 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 20299356 is about 4505.4806624821. The cubic root of 20299356 is about 272.7893556847.

The spelling of 20299356 in words is "twenty million, two hundred ninety-nine thousand, three hundred fifty-six".