20633146 has 4 divisors (see below), whose sum is σ = 30949722. Its totient is φ = 10316572.

The previous prime is 20633113. The next prime is 20633147. The reversal of 20633146 is 64133602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20602521 + 30625 = 4539^2 + 175^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20633146.

It is not an unprimeable number, because it can be changed into a prime (20633147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5158285 + ... + 5158288.

Almost surely, 2^20633146 is an apocalyptic number.

20633146 is a deficient number, since it is larger than the sum of its proper divisors (10316576).

20633146 is a wasteful number, since it uses less digits than its factorization.

20633146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10316575.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 20633146 is about 4542.3722876929. The cubic root of 20633146 is about 274.2764273011.

Adding to 20633146 its reverse (64133602), we get a palindrome (84766748).

The spelling of 20633146 in words is "twenty million, six hundred thirty-three thousand, one hundred forty-six".