20826947 has 4 divisors (see below), whose sum is σ = 21498816. Its totient is φ = 20155080.

The previous prime is 20826943. The next prime is 20826961. The reversal of 20826947 is 74962802.

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

It is a cyclic number.

It is not a de Polignac number, because 20826947 - 2² = 20826943 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20826947.

It is not an unprimeable number, because it can be changed into a prime (20826943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335888 + ... + 335949.

It is an arithmetic number, because the mean of its divisors is an integer number (5374704).

Almost surely, 2^20826947 is an apocalyptic number.

20826947 is a deficient number, since it is larger than the sum of its proper divisors (671869).

20826947 is an equidigital number, since it uses as much as digits as its factorization.

20826947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671868.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 20826947 is about 4563.6550044893. The cubic root of 20826947 is about 275.1324849237.

The spelling of 20826947 in words is "twenty million, eight hundred twenty-six thousand, nine hundred forty-seven".