20730477 has 4 divisors (see below), whose sum is σ = 27640640. Its totient is φ = 13820316.

The previous prime is 20730439. The next prime is 20730481. The reversal of 20730477 is 77403702.

It is a happy number.

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 not a de Polignac number, because 20730477 - 2¹⁵ = 20697709 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 (20730407) 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, 3455077 + ... + 3455082.

It is an arithmetic number, because the mean of its divisors is an integer number (6910160).

Almost surely, 2^20730477 is an apocalyptic number.

It is an amenable number.

20730477 is a deficient number, since it is larger than the sum of its proper divisors (6910163).

20730477 is an equidigital number, since it uses as much as digits as its factorization.

20730477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6910162.

The product of its (nonzero) digits is 8232, while the sum is 30.

The square root of 20730477 is about 4553.0733576344. The cubic root of 20730477 is about 274.7070246242.

The spelling of 20730477 in words is "twenty million, seven hundred thirty thousand, four hundred seventy-seven".