20023650 has 36 divisors (see below), whose sum is σ = 53798082. Its totient is φ = 5339520.

The previous prime is 20023649. The next prime is 20023651. The reversal of 20023650 is 5632002.

It is an interprime number because it is at equal distance from previous prime (20023649) and next prime (20023651).

It can be written as a sum of positive squares in 3 ways, for example, as 16232841 + 3790809 = 4029^2 + 1947^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20023651) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 21799 + ... + 22698.

Almost surely, 2^20023650 is an apocalyptic number.

20023650 is an abundant number, since it is smaller than the sum of its proper divisors (33774432).

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

20023650 is a wasteful number, since it uses less digits than its factorization.

20023650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44515 (or 44507 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20023650 is about 4474.7793241678. The cubic root of 20023650 is about 271.5487128084.

Adding to 20023650 its reverse (5632002), we get a palindrome (25655652).

The spelling of 20023650 in words is "twenty million, twenty-three thousand, six hundred fifty".