20531396 has 12 divisors (see below), whose sum is σ = 36422652. Its totient is φ = 10124928.

The previous prime is 20531353. The next prime is 20531417. The reversal of 20531396 is 69313502.

It can be written as a sum of positive squares in 2 ways, for example, as 3556996 + 16974400 = 1886^2 + 4120^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34865 + ... + 35448.

It is an arithmetic number, because the mean of its divisors is an integer number (3035221).

Almost surely, 2^20531396 is an apocalyptic number.

It is an amenable number.

20531396 is a deficient number, since it is larger than the sum of its proper divisors (15891256).

20531396 is a wasteful number, since it uses less digits than its factorization.

20531396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70390 (or 70388 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 20531396 is about 4531.1583507973. The cubic root of 20531396 is about 273.8248298731.

Adding to 20531396 its reverse (69313502), we get a palindrome (89844898).

The spelling of 20531396 in words is "twenty million, five hundred thirty-one thousand, three hundred ninety-six".