20820477 has 8 divisors (see below), whose sum is σ = 27793216. Its totient is φ = 13864032.

The previous prime is 20820473. The next prime is 20820491. The reversal of 20820477 is 77402802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20820477 - 2² = 20820473 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 (20820473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688 + ... + 6489.

It is an arithmetic number, because the mean of its divisors is an integer number (3474152).

Almost surely, 2^20820477 is an apocalyptic number.

It is an amenable number.

20820477 is a deficient number, since it is larger than the sum of its proper divisors (6972739).

20820477 is an equidigital number, since it uses as much as digits as its factorization.

20820477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8147.

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 20820477 is about 4562.9460877814. The cubic root of 20820477 is about 275.1039915245.

The spelling of 20820477 in words is "twenty million, eight hundred twenty thousand, four hundred seventy-seven".