20716047 has 48 divisors (see below), whose sum is σ = 35814240. Its totient is φ = 11784960.

The previous prime is 20716043. The next prime is 20716079. The reversal of 20716047 is 74061702.

It is not a de Polignac number, because 20716047 - 2² = 20716043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20716047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20716043) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 55353 + ... + 55725.

It is an arithmetic number, because the mean of its divisors is an integer number (746130).

Almost surely, 2^20716047 is an apocalyptic number.

20716047 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20716047 is a deficient number, since it is larger than the sum of its proper divisors (15098193).

20716047 is a wasteful number, since it uses less digits than its factorization.

20716047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 20716047 is about 4551.4884378629. The cubic root of 20716047 is about 274.6432707853.

Adding to 20716047 its reverse (74061702), we get a palindrome (94777749).

It can be divided in two parts, 2071 and 6047, that added together give a palindrome (8118).

The spelling of 20716047 in words is "twenty million, seven hundred sixteen thousand, forty-seven".