20107530 has 48 divisors (see below), whose sum is σ = 53973504. Its totient is φ = 5188320.

The previous prime is 20107523. The next prime is 20107541. The reversal of 20107530 is 3570102.

It is a super-3 number, since 3×20107530³ (a number of 23 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 814 + ... + 6393.

It is an arithmetic number, because the mean of its divisors is an integer number (1124448).

Almost surely, 2^20107530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20107530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26986752).

20107530 is an abundant number, since it is smaller than the sum of its proper divisors (33865974).

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

20107530 is a wasteful number, since it uses less digits than its factorization.

20107530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7251 (or 7248 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 20107530 is about 4484.1420584098. The cubic root of 20107530 is about 271.9273612982.

Adding to 20107530 its reverse (3570102), we get a palindrome (23677632).

The spelling of 20107530 in words is "twenty million, one hundred seven thousand, five hundred thirty".