31402420 has 24 divisors (see below), whose sum is σ = 75366144. Its totient is φ = 10766496.

The previous prime is 31402409. The next prime is 31402471. The reversal of 31402420 is 2420413.

It is a super-2 number, since 2×31402420² = 1972223963712800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31402394 and 31402403.

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, 112012 + ... + 112291.

It is an arithmetic number, because the mean of its divisors is an integer number (3140256).

Almost surely, 2^31402420 is an apocalyptic number.

It is an amenable number.

31402420 is an abundant number, since it is smaller than the sum of its proper divisors (43963724).

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

31402420 is a wasteful number, since it uses less digits than its factorization.

31402420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224319 (or 224317 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 31402420 is about 5603.7862200480. The cubic root of 31402420 is about 315.4915312553.

Adding to 31402420 its reverse (2420413), we get a palindrome (33822833).

The spelling of 31402420 in words is "thirty-one million, four hundred two thousand, four hundred twenty".