31403233420 has 24 divisors (see below), whose sum is σ = 71019620784. Its totient is φ = 11595039936.

The previous prime is 31403233417. The next prime is 31403233423. The reversal of 31403233420 is 2433230413.

It is an interprime number because it is at equal distance from previous prime (31403233417) and next prime (31403233423).

It is not an unprimeable number, because it can be changed into a prime (31403233423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60390574 + ... + 60391093.

It is an arithmetic number, because the mean of its divisors is an integer number (2959150866).

Almost surely, 2^31403233420 is an apocalyptic number.

It is an amenable number.

31403233420 is an abundant number, since it is smaller than the sum of its proper divisors (39616387364).

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

31403233420 is a wasteful number, since it uses less digits than its factorization.

31403233420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120781689 (or 120781687 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 31403233420 its reverse (2433230413), we get a palindrome (33836463833).

The spelling of 31403233420 in words is "thirty-one billion, four hundred three million, two hundred thirty-three thousand, four hundred twenty".