20438001 has 24 divisors (see below), whose sum is σ = 30873024. Its totient is φ = 13510800.

The previous prime is 20437999. The next prime is 20438009. The reversal of 20438001 is 10083402.

It is a happy number.

It is not a de Polignac number, because 20438001 - 2¹ = 20437999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20438009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36415 + ... + 36971.

It is an arithmetic number, because the mean of its divisors is an integer number (1286376).

Almost surely, 2^20438001 is an apocalyptic number.

It is an amenable number.

20438001 is a deficient number, since it is larger than the sum of its proper divisors (10435023).

20438001 is an equidigital number, since it uses as much as digits as its factorization.

20438001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723 (or 711 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20438001 is about 4520.8407403933. The cubic root of 20438001 is about 273.4089993108.

The spelling of 20438001 in words is "twenty million, four hundred thirty-eight thousand, one".