20472377 has 2 divisors, whose sum is σ = 20472378. Its totient is φ = 20472376.

The previous prime is 20472349. The next prime is 20472379. The reversal of 20472377 is 77327402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19571776 + 900601 = 4424^2 + 949^2 .

It is a cyclic number.

It is not a de Polignac number, because 20472377 - 2¹² = 20468281 is a prime.

Together with 20472379, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20472379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10236188 + 10236189.

It is an arithmetic number, because the mean of its divisors is an integer number (10236189).

Almost surely, 2^20472377 is an apocalyptic number.

It is an amenable number.

20472377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20472377 is an equidigital number, since it uses as much as digits as its factorization.

20472377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16464, while the sum is 32.

The square root of 20472377 is about 4524.6410907386. The cubic root of 20472377 is about 273.5622015613.

Adding to 20472377 its reverse (77327402), we get a palindrome (97799779).

The spelling of 20472377 in words is "twenty million, four hundred seventy-two thousand, three hundred seventy-seven".