20400246 has 24 divisors (see below), whose sum is σ = 45396624. Its totient is φ = 6616080.

The previous prime is 20400239. The next prime is 20400257. The reversal of 20400246 is 64200402.

20400246 is a `hidden beast` number, since 20 + 400 + 246 = 666.

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

20400246 is a modest number, since divided by 246 gives 204 as remainder.

It is a congruent 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, 14650 + ... + 15981.

It is an arithmetic number, because the mean of its divisors is an integer number (1891526).

Almost surely, 2^20400246 is an apocalyptic number.

20400246 is an abundant number, since it is smaller than the sum of its proper divisors (24996378).

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

20400246 is a wasteful number, since it uses less digits than its factorization.

20400246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30676 (or 30673 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20400246 is about 4516.6631488301. The cubic root of 20400246 is about 273.2405399204.

Adding to 20400246 its reverse (64200402), we get a palindrome (84600648).

The spelling of 20400246 in words is "twenty million, four hundred thousand, two hundred forty-six".