20477497 has 4 divisors (see below), whose sum is σ = 21555280. Its totient is φ = 19399716.

The previous prime is 20477489. The next prime is 20477519. The reversal of 20477497 is 79477402.

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 20477497 - 2³ = 20477489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20477407) 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, 538863 + ... + 538900.

It is an arithmetic number, because the mean of its divisors is an integer number (5388820).

Almost surely, 2^20477497 is an apocalyptic number.

It is an amenable number.

20477497 is a deficient number, since it is larger than the sum of its proper divisors (1077783).

20477497 is a wasteful number, since it uses less digits than its factorization.

20477497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077782.

The product of its (nonzero) digits is 98784, while the sum is 40.

The square root of 20477497 is about 4525.2068461011. The cubic root of 20477497 is about 273.5850049991.

The spelling of 20477497 in words is "twenty million, four hundred seventy-seven thousand, four hundred ninety-seven".