20840976 has 100 divisors (see below), whose sum is σ = 65012332. Its totient is φ = 6407424.

The previous prime is 20840951. The next prime is 20840977. The reversal of 20840976 is 67904802.

It can be written as a sum of positive squares in 2 ways, for example, as 9144576 + 11696400 = 3024^2 + 3420^2 .

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 20840976.

It is not an unprimeable number, because it can be changed into a prime (20840977) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16230 + ... + 17466.

Almost surely, 2^20840976 is an apocalyptic number.

20840976 is a gapful number since it is divisible by the number (26) 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 20840976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32506166).

20840976 is an abundant number, since it is smaller than the sum of its proper divisors (44171356).

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

20840976 is a wasteful number, since it uses less digits than its factorization.

20840976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270 (or 1255 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20840976 is about 4565.1917812946. The cubic root of 20840976 is about 275.1942473333.

The spelling of 20840976 in words is "twenty million, eight hundred forty thousand, nine hundred seventy-six".