20489737 has 2 divisors, whose sum is σ = 20489738. Its totient is φ = 20489736.

The previous prime is 20489723. The next prime is 20489741. The reversal of 20489737 is 73798402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20394256 + 95481 = 4516^2 + 309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20489737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20489737.

It is not a weakly prime, because it can be changed into another prime (20489767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10244868 + 10244869.

It is an arithmetic number, because the mean of its divisors is an integer number (10244869).

Almost surely, 2^20489737 is an apocalyptic number.

It is an amenable number.

20489737 is a deficient number, since it is larger than the sum of its proper divisors (1).

20489737 is an equidigital number, since it uses as much as digits as its factorization.

20489737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 20489737 is about 4526.5590684316. The cubic root of 20489737 is about 273.6395040667.

The spelling of 20489737 in words is "twenty million, four hundred eighty-nine thousand, seven hundred thirty-seven".