31361620 has 24 divisors (see below), whose sum is σ = 67392864. Its totient is φ = 12252576.

The previous prime is 31361591. The next prime is 31361641. The reversal of 31361620 is 2616313.

It is a junction number, because it is equal to n+sod(n) for n = 31361591 and 31361600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17374 + ... + 19093.

It is an arithmetic number, because the mean of its divisors is an integer number (2808036).

Almost surely, 2^31361620 is an apocalyptic number.

It is an amenable number.

31361620 is an abundant number, since it is smaller than the sum of its proper divisors (36031244).

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

31361620 is a wasteful number, since it uses less digits than its factorization.

31361620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36519 (or 36517 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 31361620 is about 5600.1446409892. The cubic root of 31361620 is about 315.3548365544.

Adding to 31361620 its reverse (2616313), we get a palindrome (33977933).

The spelling of 31361620 in words is "thirty-one million, three hundred sixty-one thousand, six hundred twenty".