20826506 has 4 divisors (see below), whose sum is σ = 31239762. Its totient is φ = 10413252.

The previous prime is 20826493. The next prime is 20826517. The reversal of 20826506 is 60562802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20784481 + 42025 = 4559^2 + 205^2 .

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 as a sum of consecutive naturals, namely, 5206625 + ... + 5206628.

Almost surely, 2^20826506 is an apocalyptic number.

20826506 is a deficient number, since it is larger than the sum of its proper divisors (10413256).

20826506 is a wasteful number, since it uses less digits than its factorization.

20826506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10413255.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 20826506 is about 4563.6066876978. The cubic root of 20826506 is about 275.1305429799.

The spelling of 20826506 in words is "twenty million, eight hundred twenty-six thousand, five hundred six".