20042001 has 12 divisors (see below), whose sum is σ = 33085312. Its totient is φ = 11452536.

The previous prime is 20041981. The next prime is 20042041. The reversal of 20042001 is 10024002.

It is not a de Polignac number, because 20042001 - 2⁵ = 20041969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20042041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159001 + ... + 159126.

Almost surely, 2^20042001 is an apocalyptic number.

20042001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20042001 is a deficient number, since it is larger than the sum of its proper divisors (13043311).

20042001 is a wasteful number, since it uses less digits than its factorization.

20042001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318140 (or 318137 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 20042001 is about 4476.8293467587. The cubic root of 20042001 is about 271.6316425589.

Adding to 20042001 its reverse (10024002), we get a palindrome (30066003).

It can be divided in two parts, 2004 and 2001, that added together give a triangular number (4005 = T₈₉).

The spelling of 20042001 in words is "twenty million, forty-two thousand, one".