20706880 has 28 divisors (see below), whose sum is σ = 49309020. Its totient is φ = 8282624.

The previous prime is 20706871. The next prime is 20706929. The reversal of 20706880 is 8860702.

It can be written as a sum of positive squares in 2 ways, for example, as 13133376 + 7573504 = 3624^2 + 2752^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32035 + ... + 32674.

Almost surely, 2^20706880 is an apocalyptic number.

20706880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20706880 is an abundant number, since it is smaller than the sum of its proper divisors (28602140).

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

20706880 is an equidigital number, since it uses as much as digits as its factorization.

20706880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64726 (or 64716 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 20706880 is about 4550.4812932260. The cubic root of 20706880 is about 274.6027542666.

It can be divided in two parts, 20 and 706880, that multiplied together give a square (14137600 = 3760²).

The spelling of 20706880 in words is "twenty million, seven hundred six thousand, eight hundred eighty".