20723047 has 2 divisors, whose sum is σ = 20723048. Its totient is φ = 20723046.

The previous prime is 20723041. The next prime is 20723063. The reversal of 20723047 is 74032702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20723047 - 2¹⁵ = 20690279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20723041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10361523 + 10361524.

It is an arithmetic number, because the mean of its divisors is an integer number (10361524).

Almost surely, 2^20723047 is an apocalyptic number.

20723047 is a deficient number, since it is larger than the sum of its proper divisors (1).

20723047 is an equidigital number, since it uses as much as digits as its factorization.

20723047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 25.

The square root of 20723047 is about 4552.2573521276. The cubic root of 20723047 is about 274.6742014997.

Adding to 20723047 its reverse (74032702), we get a palindrome (94755749).

The spelling of 20723047 in words is "twenty million, seven hundred twenty-three thousand, forty-seven".