20726890 has 16 divisors (see below), whose sum is σ = 37820808. Its totient is φ = 8176896.

The previous prime is 20726837. The next prime is 20726897. The reversal of 20726890 is 9862702.

It can be written as a sum of positive squares in 4 ways, for example, as 20457529 + 269361 = 4523^2 + 519^2 .

It is not an unprimeable number, because it can be changed into a prime (20726897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13467 + ... + 14926.

Almost surely, 2^20726890 is an apocalyptic number.

20726890 is a deficient number, since it is larger than the sum of its proper divisors (17093918).

20726890 is a wasteful number, since it uses less digits than its factorization.

20726890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28473.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20726890 is about 4552.6794308407. The cubic root of 20726890 is about 274.6911795002.

The spelling of 20726890 in words is "twenty million, seven hundred twenty-six thousand, eight hundred ninety".