31430102420 has 24 divisors (see below), whose sum is σ = 66022431048. Its totient is φ = 12568380800.

The previous prime is 31430102413. The next prime is 31430102471. The reversal of 31430102420 is 2420103413.

It can be written as a sum of positive squares in 4 ways, for example, as 891141904 + 30538960516 = 29852^2 + 174754^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31430102392 and 31430102401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157811 + ... + 296250.

It is an arithmetic number, because the mean of its divisors is an integer number (2750934627).

Almost surely, 2^31430102420 is an apocalyptic number.

It is an amenable number.

31430102420 is an abundant number, since it is smaller than the sum of its proper divisors (34592328628).

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

31430102420 is a wasteful number, since it uses less digits than its factorization.

31430102420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457531 (or 457529 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31430102420 its reverse (2420103413), we get a palindrome (33850205833).

The spelling of 31430102420 in words is "thirty-one billion, four hundred thirty million, one hundred two thousand, four hundred twenty".