20477949477 has 8 divisors (see below), whose sum is σ = 27382168800. Its totient is φ = 13612848240.

The previous prime is 20477949431. The next prime is 20477949487. The reversal of 20477949477 is 77494977402.

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

It is not a de Polignac number, because 20477949477 - 2⁶ = 20477949413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20477949477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20477949407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9778299 + ... + 9780392.

It is an arithmetic number, because the mean of its divisors is an integer number (3422771100).

Almost surely, 2^20477949477 is an apocalyptic number.

It is an amenable number.

20477949477 is a deficient number, since it is larger than the sum of its proper divisors (6904219323).

20477949477 is a wasteful number, since it uses less digits than its factorization.

20477949477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19559043.

The product of its (nonzero) digits is 24893568, while the sum is 60.

The spelling of 20477949477 in words is "twenty billion, four hundred seventy-seven million, nine hundred forty-nine thousand, four hundred seventy-seven".