20825146 has 4 divisors (see below), whose sum is σ = 31237722. Its totient is φ = 10412572.

The previous prime is 20825099. The next prime is 20825177. The reversal of 20825146 is 64152802.

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., 19847025 + 978121 = 4455^2 + 989^2 .

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 as a sum of consecutive naturals, namely, 5206285 + ... + 5206288.

Almost surely, 2^20825146 is an apocalyptic number.

20825146 is a deficient number, since it is larger than the sum of its proper divisors (10412576).

20825146 is a wasteful number, since it uses less digits than its factorization.

20825146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10412575.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 20825146 is about 4563.4576803122. The cubic root of 20825146 is about 275.1245540463.

Adding to 20825146 its reverse (64152802), we get a palindrome (84977948).

The spelling of 20825146 in words is "twenty million, eight hundred twenty-five thousand, one hundred forty-six".