20012005 has 32 divisors (see below), whose sum is σ = 27234144. Its totient is φ = 14017536.

The previous prime is 20011993. The next prime is 20012011. The reversal of 20012005 is 50021002.

It can be written as a sum of positive squares in 16 ways, for example, as 3381921 + 16630084 = 1839^2 + 4078^2 .

It is not a de Polignac number, because 20012005 - 2¹⁵ = 19979237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011982 and 20012000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127387 + ... + 127543.

It is an arithmetic number, because the mean of its divisors is an integer number (851067).

Almost surely, 2^20012005 is an apocalyptic number.

It is an amenable number.

20012005 is a deficient number, since it is larger than the sum of its proper divisors (7222139).

20012005 is a wasteful number, since it uses less digits than its factorization.

20012005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 20012005 is about 4473.4779534496. The cubic root of 20012005 is about 271.4960617689.

Adding to 20012005 its reverse (50021002), we get a palindrome (70033007).

The spelling of 20012005 in words is "twenty million, twelve thousand, five".