20078001 has 12 divisors (see below), whose sum is σ = 29107728. Its totient is φ = 13336344.

The previous prime is 20077999. The next prime is 20078021. The reversal of 20078001 is 10087002.

It is not a de Polignac number, because 20078001 - 2¹ = 20077999 is a prime.

It is a super-2 number, since 2×20078001² = 806252248312002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20078021) 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 11 ways as a sum of consecutive naturals, for example, 1395 + ... + 6488.

It is an arithmetic number, because the mean of its divisors is an integer number (2425644).

Almost surely, 2^20078001 is an apocalyptic number.

It is an amenable number.

20078001 is a deficient number, since it is larger than the sum of its proper divisors (9029727).

20078001 is a wasteful number, since it uses less digits than its factorization.

20078001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8172 (or 8169 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 20078001 is about 4480.8482455892. The cubic root of 20078001 is about 271.7941827167.

Subtracting from 20078001 its reverse (10087002), we obtain a palindrome (9990999).

The spelling of 20078001 in words is "twenty million, seventy-eight thousand, one".