20643122 has 4 divisors (see below), whose sum is σ = 30964686. Its totient is φ = 10321560.

The previous prime is 20643109. The next prime is 20643127. The reversal of 20643122 is 22134602.

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., 14830201 + 5812921 = 3851^2 + 2411^2 .

It is a super-2 number, since 2×20643122² = 852276971813768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20643094 and 20643103.

It is not an unprimeable number, because it can be changed into a prime (20643127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5160779 + ... + 5160782.

Almost surely, 2^20643122 is an apocalyptic number.

20643122 is a deficient number, since it is larger than the sum of its proper divisors (10321564).

20643122 is a wasteful number, since it uses less digits than its factorization.

20643122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10321563.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20643122 is about 4543.4702596143. The cubic root of 20643122 is about 274.3206238378.

Adding to 20643122 its reverse (22134602), we get a palindrome (42777724).

The spelling of 20643122 in words is "twenty million, six hundred forty-three thousand, one hundred twenty-two".