20503434 has 32 divisors (see below), whose sum is σ = 47005056. Its totient is φ = 5840640.

The previous prime is 20503433. The next prime is 20503453. The reversal of 20503434 is 43430502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 20503434.

It is not an unprimeable number, because it can be changed into a prime (20503433) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 21414 + ... + 22350.

It is an arithmetic number, because the mean of its divisors is an integer number (1468908).

Almost surely, 2^20503434 is an apocalyptic number.

20503434 is an abundant number, since it is smaller than the sum of its proper divisors (26501622).

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

20503434 is a wasteful number, since it uses less digits than its factorization.

20503434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470.

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 20503434 is about 4528.0717750495. The cubic root of 20503434 is about 273.7004647553.

Adding to 20503434 its reverse (43430502), we get a palindrome (63933936).

The spelling of 20503434 in words is "twenty million, five hundred three thousand, four hundred thirty-four".