20981822 has 8 divisors (see below), whose sum is σ = 31514616. Its totient is φ = 10476952.

The previous prime is 20981803. The next prime is 20981827. The reversal of 20981822 is 22818902.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20981827) 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, 4988 + ... + 8175.

It is an arithmetic number, because the mean of its divisors is an integer number (3939327).

Almost surely, 2^20981822 is an apocalyptic number.

20981822 is a deficient number, since it is larger than the sum of its proper divisors (10532794).

20981822 is a wasteful number, since it uses less digits than its factorization.

20981822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13962.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 20981822 is about 4580.5918831522. The cubic root of 20981822 is about 275.8127887470.

The spelling of 20981822 in words is "twenty million, nine hundred eighty-one thousand, eight hundred twenty-two".