20818746 has 24 divisors (see below), whose sum is σ = 48577620. Its totient is φ = 6405696.

The previous prime is 20818741. The next prime is 20818747. The reversal of 20818746 is 64781802.

It can be written as a sum of positive squares in 2 ways, for example, as 20602521 + 216225 = 4539^2 + 465^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20818746.

It is not an unprimeable number, because it can be changed into a prime (20818741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44251 + ... + 44718.

Almost surely, 2^20818746 is an apocalyptic number.

20818746 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20818746 is an abundant number, since it is smaller than the sum of its proper divisors (27758874).

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

20818746 is a wasteful number, since it uses less digits than its factorization.

20818746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88990 (or 88987 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 20818746 is about 4562.7564037542. The cubic root of 20818746 is about 275.0963673283.

The spelling of 20818746 in words is "twenty million, eight hundred eighteen thousand, seven hundred forty-six".