20500146 has 24 divisors (see below), whose sum is σ = 45618924. Its totient is φ = 6648480.

The previous prime is 20500097. The next prime is 20500159. The reversal of 20500146 is 64100502.

It is a happy number.

20500146 is a `hidden beast` number, since 20 + 500 + 146 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20385225 + 114921 = 4515^2 + 339^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

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 in 11 ways as a sum of consecutive naturals, for example, 14725 + ... + 16056.

Almost surely, 2^20500146 is an apocalyptic number.

20500146 is an abundant number, since it is smaller than the sum of its proper divisors (25118778).

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

20500146 is a wasteful number, since it uses less digits than its factorization.

20500146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30826 (or 30823 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20500146 is about 4527.7086920428. The cubic root of 20500146 is about 273.6858334626.

Adding to 20500146 its reverse (64100502), we get a palindrome (84600648).

The spelling of 20500146 in words is "twenty million, five hundred thousand, one hundred forty-six".