20477474654721 has 16 divisors (see below), whose sum is σ = 31204840203264. Its totient is φ = 11701013100624.

The previous prime is 20477474654719. The next prime is 20477474654753. The reversal of 20477474654721 is 12745647477402.

It is not a de Polignac number, because 20477474654721 - 2¹ = 20477474654719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20477474654821) 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 15 ways as a sum of consecutive naturals, for example, 16079875 + ... + 17306568.

It is an arithmetic number, because the mean of its divisors is an integer number (1950302512704).

Almost surely, 2^{20477474654721} is an apocalyptic number.

20477474654721 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20477474654721 is a deficient number, since it is larger than the sum of its proper divisors (10727365548543).

20477474654721 is a wasteful number, since it uses less digits than its factorization.

20477474654721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33415660.

The product of its (nonzero) digits is 73758720, while the sum is 60.

The spelling of 20477474654721 in words is "twenty trillion, four hundred seventy-seven billion, four hundred seventy-four million, six hundred fifty-four thousand, seven hundred twenty-one".