20010002001 has 32 divisors (see below), whose sum is σ = 31418219520. Its totient is φ = 11199988800.

The previous prime is 20010001967. The next prime is 20010002009. The reversal of 20010002001 is 10020001002.

It is a happy number.

It is not a de Polignac number, because 20010002001 - 2⁶ = 20010001937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20010002009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 432535 + ... + 476556.

It is an arithmetic number, because the mean of its divisors is an integer number (981819360).

Almost surely, 2^20010002001 is an apocalyptic number.

It is an amenable number.

20010002001 is a deficient number, since it is larger than the sum of its proper divisors (11408217519).

20010002001 is a wasteful number, since it uses less digits than its factorization.

20010002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909157.

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 20010002001 its reverse (10020001002), we get a palindrome (30030003003).

Subtracting from 20010002001 its reverse (10020001002), we obtain a palindrome (9990000999).

It can be divided in two parts, 2001000 and 2001, that added together give a triangular number (2003001 = T₂₀₀₁).

The spelling of 20010002001 in words is "twenty billion, ten million, two thousand, one".