20489736 has 16 divisors (see below), whose sum is σ = 51224400. Its totient is φ = 6829904.

The previous prime is 20489723. The next prime is 20489737. The reversal of 20489736 is 63798402.

It is a junction number, because it is equal to n+sod(n) for n = 20489694 and 20489703.

It is not an unprimeable number, because it can be changed into a prime (20489737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426846 + ... + 426893.

It is an arithmetic number, because the mean of its divisors is an integer number (3201525).

Almost surely, 2^20489736 is an apocalyptic number.

It is an amenable number.

20489736 is an abundant number, since it is smaller than the sum of its proper divisors (30734664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20489736 is a wasteful number, since it uses less digits than its factorization.

20489736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853748 (or 853744 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 20489736 is about 4526.5589579724. The cubic root of 20489736 is about 273.6394996150.

The spelling of 20489736 in words is "twenty million, four hundred eighty-nine thousand, seven hundred thirty-six".