20470477 has 4 divisors (see below), whose sum is σ = 20512000. Its totient is φ = 20428956.

The previous prime is 20470469. The next prime is 20470487. The reversal of 20470477 is 77407402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20470477 - 2³ = 20470469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20470487) 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 in 3 ways as a sum of consecutive naturals, for example, 20013 + ... + 21010.

It is an arithmetic number, because the mean of its divisors is an integer number (5128000).

Almost surely, 2^20470477 is an apocalyptic number.

It is an amenable number.

20470477 is a deficient number, since it is larger than the sum of its proper divisors (41523).

20470477 is an equidigital number, since it uses as much as digits as its factorization.

20470477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41522.

The product of its (nonzero) digits is 10976, while the sum is 31.

The square root of 20470477 is about 4524.4311244619. The cubic root of 20470477 is about 273.5537383808.

Adding to 20470477 its reverse (77407402), we get a palindrome (97877879).

The spelling of 20470477 in words is "twenty million, four hundred seventy thousand, four hundred seventy-seven".