20948537 has 2 divisors, whose sum is σ = 20948538. Its totient is φ = 20948536.

The previous prime is 20948503. The next prime is 20948563. The reversal of 20948537 is 73584902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15241216 + 5707321 = 3904^2 + 2389^2 .

It is a cyclic number.

It is not a de Polignac number, because 20948537 - 2¹⁶ = 20883001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20948537.

It is not a weakly prime, because it can be changed into another prime (20941537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10474268 + 10474269.

It is an arithmetic number, because the mean of its divisors is an integer number (10474269).

Almost surely, 2^20948537 is an apocalyptic number.

It is an amenable number.

20948537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20948537 is an equidigital number, since it uses as much as digits as its factorization.

20948537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 20948537 is about 4576.9571769900. The cubic root of 20948537 is about 275.6668642179. Note that the first 3 decimals are identical.

The spelling of 20948537 in words is "twenty million, nine hundred forty-eight thousand, five hundred thirty-seven".