20531936 has 12 divisors (see below), whose sum is σ = 40422312. Its totient is φ = 10265952.

The previous prime is 20531899. The next prime is 20531947. The reversal of 20531936 is 63913502.

It is a junction number, because it is equal to n+sod(n) for n = 20531899 and 20531908.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320780 + ... + 320843.

It is an arithmetic number, because the mean of its divisors is an integer number (3368526).

Almost surely, 2^20531936 is an apocalyptic number.

It is an amenable number.

20531936 is a deficient number, since it is larger than the sum of its proper divisors (19890376).

20531936 is an equidigital number, since it uses as much as digits as its factorization.

20531936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641633 (or 641625 counting only the distinct ones).

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

The square root of 20531936 is about 4531.2179378176. The cubic root of 20531936 is about 273.8272304910.

The spelling of 20531936 in words is "twenty million, five hundred thirty-one thousand, nine hundred thirty-six".