20205146 has 24 divisors (see below), whose sum is σ = 34684860. Its totient is φ = 8773632.

The previous prime is 20205139. The next prime is 20205193. The reversal of 20205146 is 64150202.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 6225025 + 13980121 = 2495^2 + 3739^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6170 + ... + 8858.

Almost surely, 2^20205146 is an apocalyptic number.

20205146 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20205146 is a deficient number, since it is larger than the sum of its proper divisors (14479714).

20205146 is a wasteful number, since it uses less digits than its factorization.

20205146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738 (or 2721 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20205146 is about 4495.0134593792. The cubic root of 20205146 is about 272.3666929260.

Adding to 20205146 its reverse (64150202), we get a palindrome (84355348).

The spelling of 20205146 in words is "twenty million, two hundred five thousand, one hundred forty-six".