20400361 has 16 divisors (see below), whose sum is σ = 21697984. Its totient is φ = 19160064.

The previous prime is 20400353. The next prime is 20400377. The reversal of 20400361 is 16300402.

It is a cyclic number.

It is not a de Polignac number, because 20400361 - 2³ = 20400353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20400301) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 210265 + ... + 210361.

It is an arithmetic number, because the mean of its divisors is an integer number (1356124).

Almost surely, 2^20400361 is an apocalyptic number.

It is an amenable number.

20400361 is a deficient number, since it is larger than the sum of its proper divisors (1297623).

20400361 is an equidigital number, since it uses as much as digits as its factorization.

20400361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20400361 is about 4516.6758794494. The cubic root of 20400361 is about 273.2410533555.

Adding to 20400361 its reverse (16300402), we get a palindrome (36700763).

The spelling of 20400361 in words is "twenty million, four hundred thousand, three hundred sixty-one".