20908337 has 2 divisors, whose sum is σ = 20908338. Its totient is φ = 20908336.

The previous prime is 20908331. The next prime is 20908339. The reversal of 20908337 is 73380902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10916416 + 9991921 = 3304^2 + 3161^2 .

It is a cyclic number.

It is not a de Polignac number, because 20908337 - 2⁶ = 20908273 is a prime.

It is a super-2 number, since 2×20908337² = 874317112211138, which contains 22 as substring.

Together with 20908339, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20908331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10454168 + 10454169.

It is an arithmetic number, because the mean of its divisors is an integer number (10454169).

Almost surely, 2^20908337 is an apocalyptic number.

It is an amenable number.

20908337 is a deficient number, since it is larger than the sum of its proper divisors (1).

20908337 is an equidigital number, since it uses as much as digits as its factorization.

20908337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 20908337 is about 4572.5635042064. The cubic root of 20908337 is about 275.4904174629.

The spelling of 20908337 in words is "twenty million, nine hundred eight thousand, three hundred thirty-seven".