20695537 has 2 divisors, whose sum is σ = 20695538. Its totient is φ = 20695536.

The previous prime is 20695517. The next prime is 20695553. The reversal of 20695537 is 73559602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18870336 + 1825201 = 4344^2 + 1351^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20695537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20695496 and 20695505.

It is not a weakly prime, because it can be changed into another prime (20695517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10347768 + 10347769.

It is an arithmetic number, because the mean of its divisors is an integer number (10347769).

Almost surely, 2^20695537 is an apocalyptic number.

It is an amenable number.

20695537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20695537 is an equidigital number, since it uses as much as digits as its factorization.

20695537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56700, while the sum is 37.

The square root of 20695537 is about 4549.2347708159. The cubic root of 20695537 is about 274.5526036570.

The spelling of 20695537 in words is "twenty million, six hundred ninety-five thousand, five hundred thirty-seven".