26820971 has 4 divisors (see below), whose sum is σ = 27221352. Its totient is φ = 26420592.

The previous prime is 26820943. The next prime is 26820977. The reversal of 26820971 is 17902862.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26820971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26820977) 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, 200090 + ... + 200223.

It is an arithmetic number, because the mean of its divisors is an integer number (6805338).

Almost surely, 2^26820971 is an apocalyptic number.

26820971 is a deficient number, since it is larger than the sum of its proper divisors (400381).

26820971 is an equidigital number, since it uses as much as digits as its factorization.

26820971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400380.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 26820971 is about 5178.8966971740. The cubic root of 26820971 is about 299.3354586659.

The spelling of 26820971 in words is "twenty-six million, eight hundred twenty thousand, nine hundred seventy-one".