20648722 has 4 divisors (see below), whose sum is σ = 30973086. Its totient is φ = 10324360.

The previous prime is 20648711. The next prime is 20648737. The reversal of 20648722 is 22784602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16966161 + 3682561 = 4119^2 + 1919^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5162179 + ... + 5162182.

Almost surely, 2^20648722 is an apocalyptic number.

20648722 is a deficient number, since it is larger than the sum of its proper divisors (10324364).

20648722 is a wasteful number, since it uses less digits than its factorization.

20648722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10324363.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 20648722 is about 4544.0864868530. The cubic root of 20648722 is about 274.3454272017.

The spelling of 20648722 in words is "twenty million, six hundred forty-eight thousand, seven hundred twenty-two".