20500047 has 20 divisors (see below), whose sum is σ = 30755296. Its totient is φ = 13608000.

The previous prime is 20500033. The next prime is 20500049. The reversal of 20500047 is 74000502.

It is a happy number.

It is not a de Polignac number, because 20500047 - 2¹⁰ = 20499023 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 (20500049) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 26922 + ... + 27672.

Almost surely, 2^20500047 is an apocalyptic number.

20500047 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20500047 is a deficient number, since it is larger than the sum of its proper divisors (10255249).

20500047 is an equidigital number, since it uses as much as digits as its factorization.

20500047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100 (or 1091 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 18.

The square root of 20500047 is about 4527.6977593475. The cubic root of 20500047 is about 273.6853928975.

Adding to 20500047 its reverse (74000502), we get a palindrome (94500549).

The spelling of 20500047 in words is "twenty million, five hundred thousand, forty-seven".