20210130 has 48 divisors (see below), whose sum is σ = 53837784. Its totient is φ = 5256960.

The previous prime is 20210107. The next prime is 20210131. The reversal of 20210130 is 3101202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17614809 + 2595321 = 4197^2 + 1611^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20210131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 952 + ... + 6428.

Almost surely, 2^20210130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20210130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26918892).

20210130 is an abundant number, since it is smaller than the sum of its proper divisors (33627654).

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

20210130 is a wasteful number, since it uses less digits than its factorization.

20210130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5531 (or 5528 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 20210130 is about 4495.5678173063. The cubic root of 20210130 is about 272.3890859671.

Adding to 20210130 its reverse (3101202), we get a palindrome (23311332).

The spelling of 20210130 in words is "twenty million, two hundred ten thousand, one hundred thirty".