31601020 has 36 divisors (see below), whose sum is σ = 72586584. Its totient is φ = 11460960.

The previous prime is 31600993. The next prime is 31601023. The reversal of 31601020 is 2010613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31601023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83191 + ... + 83569.

It is an arithmetic number, because the mean of its divisors is an integer number (2016294).

Almost surely, 2^31601020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31601020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36293292).

31601020 is an abundant number, since it is smaller than the sum of its proper divisors (40985564).

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

31601020 is a wasteful number, since it uses less digits than its factorization.

31601020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31601020 is about 5621.4784532185. The cubic root of 31601020 is about 316.1552273731.

Adding to 31601020 its reverse (2010613), we get a palindrome (33611633).

The spelling of 31601020 in words is "thirty-one million, six hundred one thousand, twenty".