20722380 has 48 divisors (see below), whose sum is σ = 66312960. Its totient is φ = 4736448.

The previous prime is 20722367. The next prime is 20722381. The reversal of 20722380 is 8322702.

It is a self number, because there is not a number n which added to its sum of digits gives 20722380.

It is not an unprimeable number, because it can be changed into a prime (20722381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24250 + ... + 25089.

It is an arithmetic number, because the mean of its divisors is an integer number (1381520).

Almost surely, 2^20722380 is an apocalyptic number.

20722380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20722380 is an abundant number, since it is smaller than the sum of its proper divisors (45590580).

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

20722380 is a wasteful number, since it uses less digits than its factorization.

20722380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49358 (or 49356 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20722380 is about 4552.1840911808. The cubic root of 20722380 is about 274.6712545447.

The spelling of 20722380 in words is "twenty million, seven hundred twenty-two thousand, three hundred eighty".