31220226 has 24 divisors (see below), whose sum is σ = 68345004. Its totient is φ = 10298880.

The previous prime is 31220219. The next prime is 31220239. The reversal of 31220226 is 62202213.

It can be written as a sum of positive squares in 2 ways, for example, as 30969225 + 251001 = 5565^2 + 501^2 .

It is a super-2 number, since 2×31220226² = 1949405022982152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31220199 and 31220208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7195 + ... + 10686.

Almost surely, 2^31220226 is an apocalyptic number.

31220226 is an abundant number, since it is smaller than the sum of its proper divisors (37124778).

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

31220226 is a wasteful number, since it uses less digits than its factorization.

31220226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17986 (or 17983 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31220226 is about 5587.5062416073. The cubic root of 31220226 is about 314.8801963155.

Adding to 31220226 its reverse (62202213), we get a palindrome (93422439).

The spelling of 31220226 in words is "thirty-one million, two hundred twenty thousand, two hundred twenty-six".