20731322 has 16 divisors (see below), whose sum is σ = 32721192. Its totient is φ = 9838080.

The previous prime is 20731309. The next prime is 20731327. The reversal of 20731322 is 22313702.

It can be written as a sum of positive squares in 4 ways, for example, as 12952801 + 7778521 = 3599^2 + 2789^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20731294 and 20731303.

It is not an unprimeable number, because it can be changed into a prime (20731327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383 + ... + 6450.

Almost surely, 2^20731322 is an apocalyptic number.

20731322 is a deficient number, since it is larger than the sum of its proper divisors (11989870).

20731322 is a wasteful number, since it uses less digits than its factorization.

20731322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6913.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 20731322 is about 4553.1661511524. The cubic root of 20731322 is about 274.7107570401.

The spelling of 20731322 in words is "twenty million, seven hundred thirty-one thousand, three hundred twenty-two".