20490347 has 2 divisors, whose sum is σ = 20490348. Its totient is φ = 20490346.

The previous prime is 20490343. The next prime is 20490367. The reversal of 20490347 is 74309402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20490347 - 2² = 20490343 is a prime.

It is not a weakly prime, because it can be changed into another prime (20490343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10245173 + 10245174.

It is an arithmetic number, because the mean of its divisors is an integer number (10245174).

Almost surely, 2^20490347 is an apocalyptic number.

20490347 is a deficient number, since it is larger than the sum of its proper divisors (1).

20490347 is an equidigital number, since it uses as much as digits as its factorization.

20490347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20490347 is about 4526.6264480295. The cubic root of 20490347 is about 273.6422195472.

Adding to 20490347 its reverse (74309402), we get a palindrome (94799749).

The spelling of 20490347 in words is "twenty million, four hundred ninety thousand, three hundred forty-seven".