20472797 has 2 divisors, whose sum is σ = 20472798. Its totient is φ = 20472796.

The previous prime is 20472769. The next prime is 20472821. The reversal of 20472797 is 79727402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18887716 + 1585081 = 4346^2 + 1259^2 .

It is a cyclic number.

It is not a de Polignac number, because 20472797 - 2⁶ = 20472733 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20472797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20472757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10236398 + 10236399.

It is an arithmetic number, because the mean of its divisors is an integer number (10236399).

Almost surely, 2^20472797 is an apocalyptic number.

It is an amenable number.

20472797 is a deficient number, since it is larger than the sum of its proper divisors (1).

20472797 is an equidigital number, since it uses as much as digits as its factorization.

20472797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 20472797 is about 4524.6875030216. The cubic root of 20472797 is about 273.5640722989.

The spelling of 20472797 in words is "twenty million, four hundred seventy-two thousand, seven hundred ninety-seven".