20450979 has 24 divisors (see below), whose sum is σ = 31828992. Its totient is φ = 12616560.

The previous prime is 20450939. The next prime is 20450981. The reversal of 20450979 is 97905402.

It is not a de Polignac number, because 20450979 - 2⁹ = 20450467 is a prime.

It is a super-3 number, since 3×20450979³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20450939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4824 + ... + 8010.

It is an arithmetic number, because the mean of its divisors is an integer number (1326208).

Almost surely, 2^20450979 is an apocalyptic number.

20450979 is a deficient number, since it is larger than the sum of its proper divisors (11378013).

20450979 is a wasteful number, since it uses less digits than its factorization.

20450979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3247 (or 3244 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 20450979 is about 4522.2758650927. The cubic root of 20450979 is about 273.4668580549.

The spelling of 20450979 in words is "twenty million, four hundred fifty thousand, nine hundred seventy-nine".