20968506 has 72 divisors (see below), whose sum is σ = 50444316. Its totient is φ = 6289920.

The previous prime is 20968499. The next prime is 20968511. The reversal of 20968506 is 60586902.

It can be written as a sum of positive squares in 6 ways, for example, as 1121481 + 19847025 = 1059^2 + 4455^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 185506 + ... + 185618.

Almost surely, 2^20968506 is an apocalyptic number.

20968506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20968506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25222158).

20968506 is an abundant number, since it is smaller than the sum of its proper divisors (29475810).

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

20968506 is a wasteful number, since it uses less digits than its factorization.

20968506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 20968506 is about 4579.1381285128. The cubic root of 20968506 is about 275.7544287004.

The spelling of 20968506 in words is "twenty million, nine hundred sixty-eight thousand, five hundred six".