20126730 has 32 divisors (see below), whose sum is σ = 52020864. Its totient is φ = 4954176.

The previous prime is 20126713. The next prime is 20126731. The reversal of 20126730 is 3762102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20126697 and 20126706.

It is not an unprimeable number, because it can be changed into a prime (20126731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25414 + ... + 26193.

It is an arithmetic number, because the mean of its divisors is an integer number (1625652).

Almost surely, 2^20126730 is an apocalyptic number.

20126730 is an abundant number, since it is smaller than the sum of its proper divisors (31894134).

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

20126730 is a wasteful number, since it uses less digits than its factorization.

20126730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51630.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 20126730 is about 4486.2824253495. The cubic root of 20126730 is about 272.0138851764.

Adding to 20126730 its reverse (3762102), we get a palindrome (23888832).

The spelling of 20126730 in words is "twenty million, one hundred twenty-six thousand, seven hundred thirty".