20606172747 has 16 divisors (see below), whose sum is σ = 27857071488. Its totient is φ = 13546440000.

The previous prime is 20606172721. The next prime is 20606172751. The reversal of 20606172747 is 74727160602.

It is not a de Polignac number, because 20606172747 - 2²⁰ = 20605124171 is a prime.

It is a super-2 number, since 2×20606172747² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20606172699 and 20606172708.

It is not an unprimeable number, because it can be changed into a prime (20606172757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1825872 + ... + 1837122.

It is an arithmetic number, because the mean of its divisors is an integer number (1741066968).

Almost surely, 2^20606172747 is an apocalyptic number.

20606172747 is a deficient number, since it is larger than the sum of its proper divisors (7250898741).

20606172747 is a wasteful number, since it uses less digits than its factorization.

20606172747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19690.

The product of its (nonzero) digits is 197568, while the sum is 42.

The spelling of 20606172747 in words is "twenty billion, six hundred six million, one hundred seventy-two thousand, seven hundred forty-seven".