31404420420 has 96 divisors (see below), whose sum is σ = 92012712960. Its totient is φ = 7993313280.

The previous prime is 31404420401. The next prime is 31404420449. The reversal of 31404420420 is 2402440413.

It is a happy number.

It is a super-2 number, since 2×31404420420² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20136 + ... + 251424.

It is an arithmetic number, because the mean of its divisors is an integer number (958465760).

Almost surely, 2^31404420420 is an apocalyptic number.

31404420420 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 31404420420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46006356480).

31404420420 is an abundant number, since it is smaller than the sum of its proper divisors (60608292540).

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

31404420420 is a wasteful number, since it uses less digits than its factorization.

31404420420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231405 (or 231403 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 31404420420 its reverse (2402440413), we get a palindrome (33806860833).

The spelling of 31404420420 in words is "thirty-one billion, four hundred four million, four hundred twenty thousand, four hundred twenty".