20489757 has 12 divisors (see below), whose sum is σ = 28561344. Its totient is φ = 13064920.

The previous prime is 20489753. The next prime is 20489759. The reversal of 20489757 is 75798402.

It is not a de Polignac number, because 20489757 - 2² = 20489753 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20489753) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4869 + ... + 8042.

It is an arithmetic number, because the mean of its divisors is an integer number (2380112).

Almost surely, 2^20489757 is an apocalyptic number.

It is an amenable number.

20489757 is a deficient number, since it is larger than the sum of its proper divisors (8071587).

20489757 is a wasteful number, since it uses less digits than its factorization.

20489757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12960 (or 12937 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 20489757 is about 4526.5612776146. The cubic root of 20489757 is about 273.6395930997.

The spelling of 20489757 in words is "twenty million, four hundred eighty-nine thousand, seven hundred fifty-seven".