20420484991477 has 8 divisors (see below), whose sum is σ = 20429523221472. Its totient is φ = 20411447718000.

The previous prime is 20420484991469. The next prime is 20420484991519. The reversal of 20420484991477 is 77419948402402.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20420484991477 - 2³ = 20420484991469 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 (20420484991447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44293602 + ... + 44752252.

It is an arithmetic number, because the mean of its divisors is an integer number (2553690402684).

Almost surely, 2^{20420484991477} is an apocalyptic number.

It is an amenable number.

20420484991477 is a deficient number, since it is larger than the sum of its proper divisors (9038229995).

20420484991477 is a wasteful number, since it uses less digits than its factorization.

20420484991477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478259.

The product of its (nonzero) digits is 32514048, while the sum is 61.

The spelling of 20420484991477 in words is "twenty trillion, four hundred twenty billion, four hundred eighty-four million, nine hundred ninety-one thousand, four hundred seventy-seven".