20842146 has 24 divisors (see below), whose sum is σ = 48632220. Its totient is φ = 6412896.

The previous prime is 20842141. The next prime is 20842147. The reversal of 20842146 is 64124802.

It can be written as a sum of positive squares in 2 ways, for example, as 17969121 + 2873025 = 4239^2 + 1695^2 .

It is not an unprimeable number, because it can be changed into a prime (20842141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44301 + ... + 44768.

Almost surely, 2^20842146 is an apocalyptic number.

20842146 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20842146 is an abundant number, since it is smaller than the sum of its proper divisors (27790074).

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

20842146 is a wasteful number, since it uses less digits than its factorization.

20842146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89090 (or 89087 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20842146 is about 4565.3199230722. The cubic root of 20842146 is about 275.1993969841.

Adding to 20842146 its reverse (64124802), we get a palindrome (84966948).

The spelling of 20842146 in words is "twenty million, eight hundred forty-two thousand, one hundred forty-six".