20643126 has 16 divisors (see below), whose sum is σ = 47184384. Its totient is φ = 5898024.

The previous prime is 20643109. The next prime is 20643127. The reversal of 20643126 is 62134602.

It is a super-2 number, since 2×20643126² = 852277302103752, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20643096 and 20643105.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 245710 + ... + 245793.

It is an arithmetic number, because the mean of its divisors is an integer number (2949024).

Almost surely, 2^20643126 is an apocalyptic number.

20643126 is an abundant number, since it is smaller than the sum of its proper divisors (26541258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20643126 is a wasteful number, since it uses less digits than its factorization.

20643126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491515.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20643126 is about 4543.4706998065. The cubic root of 20643126 is about 274.3206415561.

Adding to 20643126 its reverse (62134602), we get a palindrome (82777728).

The spelling of 20643126 in words is "twenty million, six hundred forty-three thousand, one hundred twenty-six".