20722636 has 24 divisors (see below), whose sum is σ = 39836160. Its totient is φ = 9354000.

The previous prime is 20722621. The next prime is 20722649. The reversal of 20722636 is 63622702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5085 + ... + 8203.

It is an arithmetic number, because the mean of its divisors is an integer number (1659840).

Almost surely, 2^20722636 is an apocalyptic number.

It is an amenable number.

20722636 is a deficient number, since it is larger than the sum of its proper divisors (19113524).

20722636 is a wasteful number, since it uses less digits than its factorization.

20722636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3285 (or 3283 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 20722636 is about 4552.2122094648. The cubic root of 20722636 is about 274.6723856174.

The spelling of 20722636 in words is "twenty million, seven hundred twenty-two thousand, six hundred thirty-six".