20021901409 has 8 divisors (see below), whose sum is σ = 20185054208. Its totient is φ = 19858834800.

The previous prime is 20021901401. The next prime is 20021901433. The reversal of 20021901409 is 90410912002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20021901409 - 2³ = 20021901401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021901401) 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 7 ways as a sum of consecutive naturals, for example, 495019 + ... + 533935.

It is an arithmetic number, because the mean of its divisors is an integer number (2523131776).

Almost surely, 2^20021901409 is an apocalyptic number.

It is an amenable number.

20021901409 is a deficient number, since it is larger than the sum of its proper divisors (163152799).

20021901409 is a wasteful number, since it uses less digits than its factorization.

20021901409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43095.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 20021901409 in words is "twenty billion, twenty-one million, nine hundred one thousand, four hundred nine".