31404020 has 24 divisors (see below), whose sum is σ = 67032168. Its totient is φ = 12355200.

The previous prime is 31404011. The next prime is 31404047. The reversal of 31404020 is 2040413.

It can be written as a sum of positive squares in 4 ways, for example, as 512656 + 30891364 = 716^2 + 5558^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31403986 and 31404004.

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, 11651 + ... + 14090.

It is an arithmetic number, because the mean of its divisors is an integer number (2793007).

Almost surely, 2^31404020 is an apocalyptic number.

It is an amenable number.

31404020 is an abundant number, since it is smaller than the sum of its proper divisors (35628148).

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

31404020 is a wasteful number, since it uses less digits than its factorization.

31404020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25811 (or 25809 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 31404020 is about 5603.9289788505. The cubic root of 31404020 is about 315.4968894186.

Adding to 31404020 its reverse (2040413), we get a palindrome (33444433).

It can be divided in two parts, 3140 and 4020, that multiplied together give a triangular number (12622800 = T₅₀₂₄).

The spelling of 31404020 in words is "thirty-one million, four hundred four thousand, twenty".