20826905 has 8 divisors (see below), whose sum is σ = 27264384. Its totient is φ = 15146800.

The previous prime is 20826889. The next prime is 20826919. The reversal of 20826905 is 50962802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20826905 - 2⁴ = 20826889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189281 + ... + 189390.

It is an arithmetic number, because the mean of its divisors is an integer number (3408048).

Almost surely, 2^20826905 is an apocalyptic number.

It is an amenable number.

20826905 is a deficient number, since it is larger than the sum of its proper divisors (6437479).

20826905 is a wasteful number, since it uses less digits than its factorization.

20826905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378687.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20826905 is about 4563.6504029121. The cubic root of 20826905 is about 275.1322999779.

The spelling of 20826905 in words is "twenty million, eight hundred twenty-six thousand, nine hundred five".