31402420420 has 24 divisors (see below), whose sum is σ = 75365809344. Its totient is φ = 10766544096.

The previous prime is 31402420409. The next prime is 31402420429. The reversal of 31402420420 is 2402420413.

It is a happy number.

It is a super-2 number, since 2×31402420420² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31402420391 and 31402420400.

It is not an unprimeable number, because it can be changed into a prime (31402420429) 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, 112151362 + ... + 112151641.

It is an arithmetic number, because the mean of its divisors is an integer number (3140242056).

Almost surely, 2^31402420420 is an apocalyptic number.

It is an amenable number.

31402420420 is an abundant number, since it is smaller than the sum of its proper divisors (43963388924).

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

31402420420 is a wasteful number, since it uses less digits than its factorization.

31402420420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224303019 (or 224303017 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 31402420420 its reverse (2402420413), we get a palindrome (33804840833).

The spelling of 31402420420 in words is "thirty-one billion, four hundred two million, four hundred twenty thousand, four hundred twenty".