20948387 has 2 divisors, whose sum is σ = 20948388. Its totient is φ = 20948386.

The previous prime is 20948371. The next prime is 20948399. The reversal of 20948387 is 78384902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20948387 - 2⁴ = 20948371 is a prime.

It is not a weakly prime, because it can be changed into another prime (20948687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10474193 + 10474194.

It is an arithmetic number, because the mean of its divisors is an integer number (10474194).

Almost surely, 2^20948387 is an apocalyptic number.

20948387 is a deficient number, since it is larger than the sum of its proper divisors (1).

20948387 is an equidigital number, since it uses as much as digits as its factorization.

20948387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 20948387 is about 4576.9407905281. The cubic root of 20948387 is about 275.6662062542. Note that the first 3 decimals are identical.

The spelling of 20948387 in words is "twenty million, nine hundred forty-eight thousand, three hundred eighty-seven".