20489901 has 4 divisors (see below), whose sum is σ = 27319872. Its totient is φ = 13659932.

The previous prime is 20489899. The next prime is 20489927. The reversal of 20489901 is 10998402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20489901 - 2¹ = 20489899 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20489101) 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 3 ways as a sum of consecutive naturals, for example, 3414981 + ... + 3414986.

It is an arithmetic number, because the mean of its divisors is an integer number (6829968).

Almost surely, 2^20489901 is an apocalyptic number.

It is an amenable number.

20489901 is a deficient number, since it is larger than the sum of its proper divisors (6829971).

20489901 is an equidigital number, since it uses as much as digits as its factorization.

20489901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6829970.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 20489901 is about 4526.5771837007. The cubic root of 20489901 is about 273.6402341356.

The spelling of 20489901 in words is "twenty million, four hundred eighty-nine thousand, nine hundred one".