20568436 has 36 divisors (see below), whose sum is σ = 44341668. Its totient is φ = 8295168.

The previous prime is 20568421. The next prime is 20568451. The reversal of 20568436 is 63486502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20568421) and next prime (20568451).

It can be written as a sum of positive squares in 2 ways, for example, as 6280036 + 14288400 = 2506^2 + 3780^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 246 + ... + 6418.

It is an arithmetic number, because the mean of its divisors is an integer number (1231713).

Almost surely, 2^20568436 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 20568436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22170834).

20568436 is an abundant number, since it is smaller than the sum of its proper divisors (23773232).

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

20568436 is a wasteful number, since it uses less digits than its factorization.

20568436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6208 (or 6199 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 20568436 is about 4535.2437641212. The cubic root of 20568436 is about 273.9893970003.

The spelling of 20568436 in words is "twenty million, five hundred sixty-eight thousand, four hundred thirty-six".