20489677 has 16 divisors (see below), whose sum is σ = 22740480. Its totient is φ = 18345600.

The previous prime is 20489671. The next prime is 20489681. The reversal of 20489677 is 77698402.

It is a de Polignac number, because none of the positive numbers 2^k-20489677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20489671) 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, 72777 + ... + 73057.

It is an arithmetic number, because the mean of its divisors is an integer number (1421280).

Almost surely, 2^20489677 is an apocalyptic number.

It is an amenable number.

20489677 is a deficient number, since it is larger than the sum of its proper divisors (2250803).

20489677 is a wasteful number, since it uses less digits than its factorization.

20489677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 20489677 is about 4526.5524408759. The cubic root of 20489677 is about 273.6392369673.

The spelling of 20489677 in words is "twenty million, four hundred eighty-nine thousand, six hundred seventy-seven".