20722246 has 4 divisors (see below), whose sum is σ = 31083372. Its totient is φ = 10361122.

The previous prime is 20722237. The next prime is 20722277. The reversal of 20722246 is 64222702.

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

It is a super-2 number, since 2×20722246² = 858822958569032, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20722246.

It is a congruent number.

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, 5180560 + ... + 5180563.

It is an arithmetic number, because the mean of its divisors is an integer number (7770843).

Almost surely, 2^20722246 is an apocalyptic number.

20722246 is a deficient number, since it is larger than the sum of its proper divisors (10361126).

20722246 is a wasteful number, since it uses less digits than its factorization.

20722246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10361125.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 20722246 is about 4552.1693729474. The cubic root of 20722246 is about 274.6706624952.

Adding to 20722246 its reverse (64222702), we get a palindrome (84944948).

The spelling of 20722246 in words is "twenty million, seven hundred twenty-two thousand, two hundred forty-six".