20726847 has 10 divisors (see below), whose sum is σ = 30962448. Its totient is φ = 13817844.

The previous prime is 20726837. The next prime is 20726897. The reversal of 20726847 is 74862702.

It is a de Polignac number, because none of the positive numbers 2^k-20726847 is a prime.

It is a super-2 number, since 2×20726847² = 859204373122818, which contains 22 as substring.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20726807) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 127863 + ... + 128024.

Almost surely, 2^20726847 is an apocalyptic number.

20726847 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20726847 is a deficient number, since it is larger than the sum of its proper divisors (10235601).

20726847 is an equidigital number, since it uses as much as digits as its factorization.

20726847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255899 (or 255890 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 20726847 is about 4552.6747083445. The cubic root of 20726847 is about 274.6909895420.

The spelling of 20726847 in words is "twenty million, seven hundred twenty-six thousand, eight hundred forty-seven".