31021030020 has 48 divisors (see below), whose sum is σ = 86920162560. Its totient is φ = 8266438656.

The previous prime is 31021030013. The next prime is 31021030031. The reversal of 31021030020 is 2003012013.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 31021029978 and 31021030005.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96285 + ... + 267044.

It is an arithmetic number, because the mean of its divisors is an integer number (1810836720).

Almost surely, 2^31021030020 is an apocalyptic number.

31021030020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31021030020 is an abundant number, since it is smaller than the sum of its proper divisors (55899132540).

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

31021030020 is a wasteful number, since it uses less digits than its factorization.

31021030020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364764 (or 364762 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 31021030020 its reverse (2003012013), we get a palindrome (33024042033).

The spelling of 31021030020 in words is "thirty-one billion, twenty-one million, thirty thousand, twenty".