31220420200 has 48 divisors (see below), whose sum is σ = 72622812780. Its totient is φ = 12482088960.

The previous prime is 31220420167. The next prime is 31220420227. The reversal of 31220420200 is 202402213.

It can be written as a sum of positive squares in 6 ways, for example, as 152127556 + 31068292644 = 12334^2 + 176262^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 385662 + ... + 459538.

Almost surely, 2^31220420200 is an apocalyptic number.

It is an amenable number.

31220420200 is an abundant number, since it is smaller than the sum of its proper divisors (41402392580).

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

31220420200 is a wasteful number, since it uses less digits than its factorization.

31220420200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76006 (or 75997 counting only the distinct ones).

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

Adding to 31220420200 its reverse (202402213), we get a palindrome (31422822413).

The spelling of 31220420200 in words is "thirty-one billion, two hundred twenty million, four hundred twenty thousand, two hundred".