20501330 has 32 divisors (see below), whose sum is σ = 38511936. Its totient is φ = 7850304.

The previous prime is 20501329. The next prime is 20501333. The reversal of 20501330 is 3310502.

It is not an unprimeable number, because it can be changed into a prime (20501333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24377 + ... + 25203.

It is an arithmetic number, because the mean of its divisors is an integer number (1203498).

Almost surely, 2^20501330 is an apocalyptic number.

20501330 is a deficient number, since it is larger than the sum of its proper divisors (18010606).

20501330 is a wasteful number, since it uses less digits than its factorization.

20501330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938.

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 20501330 is about 4527.8394406162. The cubic root of 20501330 is about 273.6911023322.

Adding to 20501330 its reverse (3310502), we get a palindrome (23811832).

The spelling of 20501330 in words is "twenty million, five hundred one thousand, three hundred thirty".