31011143020 has 96 divisors (see below), whose sum is σ = 77266840896. Its totient is φ = 10306176000.

The previous prime is 31011142957. The next prime is 31011143021. The reversal of 31011143020 is 2034111013.

It is a junction number, because it is equal to n+sod(n) for n = 31011142985 and 31011143003.

It is not an unprimeable number, because it can be changed into a prime (31011143021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 235182 + ... + 342538.

It is an arithmetic number, because the mean of its divisors is an integer number (804862926).

Almost surely, 2^31011143020 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 31011143020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38633420448).

31011143020 is an abundant number, since it is smaller than the sum of its proper divisors (46255697876).

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

31011143020 is a wasteful number, since it uses less digits than its factorization.

31011143020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107491 (or 107489 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31011143020 its reverse (2034111013), we get a palindrome (33045254033).

The spelling of 31011143020 in words is "thirty-one billion, eleven million, one hundred forty-three thousand, twenty".