31420040420 has 12 divisors (see below), whose sum is σ = 65982084924. Its totient is φ = 12568016160.

The previous prime is 31420040419. The next prime is 31420040423. The reversal of 31420040420 is 2404002413.

It can be written as a sum of positive squares in 2 ways, for example, as 24301068544 + 7118971876 = 155888^2 + 84374^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1571002021 = 31420040420 / (3 + 1 + 4 + 2 + 0 + 0 + 4 + 0 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 31420040392 and 31420040401.

It is not an unprimeable number, because it can be changed into a prime (31420040423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785500991 + ... + 785501030.

It is an arithmetic number, because the mean of its divisors is an integer number (5498507077).

Almost surely, 2^31420040420 is an apocalyptic number.

It is an amenable number.

31420040420 is an abundant number, since it is smaller than the sum of its proper divisors (34562044504).

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

31420040420 is a wasteful number, since it uses less digits than its factorization.

31420040420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571002030 (or 1571002028 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 31420040420 its reverse (2404002413), we get a palindrome (33824042833).

The spelling of 31420040420 in words is "thirty-one billion, four hundred twenty million, forty thousand, four hundred twenty".