20531046 has 16 divisors (see below), whose sum is σ = 41557824. Its totient is φ = 6761064.

The previous prime is 20531023. The next prime is 20531059. The reversal of 20531046 is 64013502.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20116 + ... + 21111.

It is an arithmetic number, because the mean of its divisors is an integer number (2597364).

Almost surely, 2^20531046 is an apocalyptic number.

20531046 is an abundant number, since it is smaller than the sum of its proper divisors (21026778).

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

20531046 is a wasteful number, since it uses less digits than its factorization.

20531046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41315.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20531046 is about 4531.1197291619. The cubic root of 20531046 is about 273.8232738945.

Adding to 20531046 its reverse (64013502), we get a palindrome (84544548).

The spelling of 20531046 in words is "twenty million, five hundred thirty-one thousand, forty-six".