20904822 has 48 divisors (see below), whose sum is σ = 46812480. Its totient is φ = 6739200.

The previous prime is 20904817. The next prime is 20904827. The reversal of 20904822 is 22840902.

It is an interprime number because it is at equal distance from previous prime (20904817) and next prime (20904827).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20904827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86622 + ... + 86862.

It is an arithmetic number, because the mean of its divisors is an integer number (975260).

Almost surely, 2^20904822 is an apocalyptic number.

20904822 is the 2892-nd heptagonal number.

20904822 is an abundant number, since it is smaller than the sum of its proper divisors (25907658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20904822 is a wasteful number, since it uses less digits than its factorization.

20904822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20904822 is about 4572.1791303491. The cubic root of 20904822 is about 275.4749785961.

The spelling of 20904822 in words is "twenty million, nine hundred four thousand, eight hundred twenty-two".