19970737 has 2 divisors, whose sum is σ = 19970738. Its totient is φ = 19970736.

The previous prime is 19970719. The next prime is 19970747. The reversal of 19970737 is 73707991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18870336 + 1100401 = 4344^2 + 1049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19970737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19970693 and 19970702.

It is not a weakly prime, because it can be changed into another prime (19970707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9985368 + 9985369.

It is an arithmetic number, because the mean of its divisors is an integer number (9985369).

Almost surely, 2^19970737 is an apocalyptic number.

It is an amenable number.

19970737 is a deficient number, since it is larger than the sum of its proper divisors (1).

19970737 is an equidigital number, since it uses as much as digits as its factorization.

19970737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 83349, while the sum is 43.

The square root of 19970737 is about 4468.8630545140. The cubic root of 19970737 is about 271.3093103686.

The spelling of 19970737 in words is "nineteen million, nine hundred seventy thousand, seven hundred thirty-seven".