20647368 has 96 divisors (see below), whose sum is σ = 64920960. Its totient is φ = 5806080.

The previous prime is 20647351. The next prime is 20647387. The reversal of 20647368 is 86374602.

20647368 is a `hidden beast` number, since 2 + 0 + 647 + 3 + 6 + 8 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35496 + ... + 36072.

It is an arithmetic number, because the mean of its divisors is an integer number (676260).

Almost surely, 2^20647368 is an apocalyptic number.

20647368 is a gapful number since it is divisible by the number (28) 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 20647368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32460480).

20647368 is an abundant number, since it is smaller than the sum of its proper divisors (44273592).

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

20647368 is a wasteful number, since it uses less digits than its factorization.

20647368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 20647368 is about 4543.9374995702. The cubic root of 20647368 is about 274.3394305137.

It can be divided in two parts, 206 and 47368, that added together give a palindrome (47574).

The spelling of 20647368 in words is "twenty million, six hundred forty-seven thousand, three hundred sixty-eight".