20500442 has 16 divisors (see below), whose sum is σ = 31703400. Its totient is φ = 9934848.

The previous prime is 20500439. The next prime is 20500457. The reversal of 20500442 is 24400502.

It can be written as a sum of positive squares in 4 ways, for example, as 17147881 + 3352561 = 4141^2 + 1831^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20500442.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32918 + ... + 33534.

Almost surely, 2^20500442 is an apocalyptic number.

20500442 is a deficient number, since it is larger than the sum of its proper divisors (11202958).

20500442 is a wasteful number, since it uses less digits than its factorization.

20500442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105.

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 20500442 is about 4527.7413795401. The cubic root of 20500442 is about 273.6871506990.

Adding to 20500442 its reverse (24400502), we get a palindrome (44900944).

It can be divided in two parts, 205004 and 42, that multiplied together give a palindrome (8610168).

The spelling of 20500442 in words is "twenty million, five hundred thousand, four hundred forty-two".