20122643 has 8 divisors (see below), whose sum is σ = 20505600. Its totient is φ = 19743048.

The previous prime is 20122637. The next prime is 20122649. The reversal of 20122643 is 34622102.

It is an interprime number because it is at equal distance from previous prime (20122637) and next prime (20122649).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20122643 - 2²⁰ = 19074067 is a prime.

It is a super-2 number, since 2×20122643² = 809841522610898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20122649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13430 + ... + 14852.

It is an arithmetic number, because the mean of its divisors is an integer number (2563200).

Almost surely, 2^20122643 is an apocalyptic number.

20122643 is a deficient number, since it is larger than the sum of its proper divisors (382957).

20122643 is a wasteful number, since it uses less digits than its factorization.

20122643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1681.

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

The square root of 20122643 is about 4485.8269025900. The cubic root of 20122643 is about 271.9954719186.

Adding to 20122643 its reverse (34622102), we get a palindrome (54744745).

The spelling of 20122643 in words is "twenty million, one hundred twenty-two thousand, six hundred forty-three".