20912001 has 16 divisors (see below), whose sum is σ = 30628800. Its totient is φ = 12585920.

The previous prime is 20911963. The next prime is 20912029. The reversal of 20912001 is 10021902.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20912001 - 2⁷ = 20911873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20912041) 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 15 ways as a sum of consecutive naturals, for example, 2791 + ... + 7043.

It is an arithmetic number, because the mean of its divisors is an integer number (1914300).

Almost surely, 2^20912001 is an apocalyptic number.

It is an amenable number.

20912001 is a deficient number, since it is larger than the sum of its proper divisors (9716799).

20912001 is a wasteful number, since it uses less digits than its factorization.

20912001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4416.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 20912001 is about 4572.9641371872. The cubic root of 20912001 is about 275.5065089376.

Adding to 20912001 its reverse (10021902), we get a palindrome (30933903).

The spelling of 20912001 in words is "twenty million, nine hundred twelve thousand, one".