20722750 has 16 divisors (see below), whose sum is σ = 38793456. Its totient is φ = 8289000.

The previous prime is 20722687. The next prime is 20722769. The reversal of 20722750 is 5722702.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

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, 41196 + ... + 41695.

It is an arithmetic number, because the mean of its divisors is an integer number (2424591).

Almost surely, 2^20722750 is an apocalyptic number.

20722750 is a deficient number, since it is larger than the sum of its proper divisors (18070706).

20722750 is an equidigital number, since it uses as much as digits as its factorization.

20722750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82908 (or 82898 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 20722750 is about 4552.2247308322. The cubic root of 20722750 is about 274.6728892951.

The spelling of 20722750 in words is "twenty million, seven hundred twenty-two thousand, seven hundred fifty".