31423020032 has 44 divisors (see below), whose sum is σ = 63201059496. Its totient is φ = 15615037440.

The previous prime is 31423020023. The next prime is 31423020047. The reversal of 31423020032 is 23002032413.

It is a junction number, because it is equal to n+sod(n) for n = 31423019986 and 31423020013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72782 + ... + 261042.

Almost surely, 2^31423020032 is an apocalyptic number.

31423020032 is a gapful number since it is divisible by the number (32) 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 31423020032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31600529748).

31423020032 is an abundant number, since it is smaller than the sum of its proper divisors (31778039464).

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

31423020032 is a wasteful number, since it uses less digits than its factorization.

31423020032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188444 (or 188426 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 31423020032 its reverse (23002032413), we get a palindrome (54425052445).

The spelling of 31423020032 in words is "thirty-one billion, four hundred twenty-three million, twenty thousand, thirty-two".