31023223020 has 192 divisors, whose sum is σ = 97728583680. Its totient is φ = 8169465600.

The previous prime is 31023223003. The next prime is 31023223037. The reversal of 31023223020 is 2032232013.

It is a happy number.

31023223020 is a `hidden beast` number, since 310 + 2 + 322 + 30 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (31023223003) and next prime (31023223037).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31023222984 and 31023223002.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30089905 + ... + 30090935.

It is an arithmetic number, because the mean of its divisors is an integer number (509003040).

Almost surely, 2^31023223020 is an apocalyptic number.

31023223020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31023223020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48864291840).

31023223020 is an abundant number, since it is smaller than the sum of its proper divisors (66705360660).

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

31023223020 is a wasteful number, since it uses less digits than its factorization.

31023223020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693 (or 1685 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 31023223020 its reverse (2032232013), we get a palindrome (33055455033).

The spelling of 31023223020 in words is "thirty-one billion, twenty-three million, two hundred twenty-three thousand, twenty".