20628247 has 2 divisors, whose sum is σ = 20628248. Its totient is φ = 20628246.

The previous prime is 20628233. The next prime is 20628271. The reversal of 20628247 is 74282602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20628247 - 2²³ = 12239639 is a prime.

It is a super-3 number, since 3×20628247³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20628287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10314123 + 10314124.

It is an arithmetic number, because the mean of its divisors is an integer number (10314124).

Almost surely, 2^20628247 is an apocalyptic number.

20628247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20628247 is an equidigital number, since it uses as much as digits as its factorization.

20628247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 20628247 is about 4541.8330000122. The cubic root of 20628247 is about 274.2547181125.

The spelling of 20628247 in words is "twenty million, six hundred twenty-eight thousand, two hundred forty-seven".