31020220230 has 128 divisors (see below), whose sum is σ = 79073280000. Its totient is φ = 7766409600.

The previous prime is 31020220207. The next prime is 31020220237. The reversal of 31020220230 is 3202202013.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020220237) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 54325845 + ... + 54326415.

It is an arithmetic number, because the mean of its divisors is an integer number (617760000).

Almost surely, 2^31020220230 is an apocalyptic number.

31020220230 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31020220230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39536640000).

31020220230 is an abundant number, since it is smaller than the sum of its proper divisors (48053059770).

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

31020220230 is a wasteful number, since it uses less digits than its factorization.

31020220230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290.

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 31020220230 its reverse (3202202013), we get a palindrome (34222422243).

The spelling of 31020220230 in words is "thirty-one billion, twenty million, two hundred twenty thousand, two hundred thirty".