20743537 has 2 divisors, whose sum is σ = 20743538. Its totient is φ = 20743536.

The previous prime is 20743531. The next prime is 20743559. The reversal of 20743537 is 73534702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20394256 + 349281 = 4516^2 + 591^2 .

It is a cyclic number.

It is not a de Polignac number, because 20743537 - 2⁷ = 20743409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20743499 and 20743508.

It is not a weakly prime, because it can be changed into another prime (20743531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10371768 + 10371769.

It is an arithmetic number, because the mean of its divisors is an integer number (10371769).

Almost surely, 2^20743537 is an apocalyptic number.

It is an amenable number.

20743537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20743537 is an equidigital number, since it uses as much as digits as its factorization.

20743537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 31.

The square root of 20743537 is about 4554.5073279115. The cubic root of 20743537 is about 274.7647001038.

The spelling of 20743537 in words is "twenty million, seven hundred forty-three thousand, five hundred thirty-seven".