20021040245 has 8 divisors (see below), whose sum is σ = 24052339584. Its totient is φ = 15998771344.

The previous prime is 20021040239. The next prime is 20021040251. The reversal of 20021040245 is 54204012002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20021040239) and next prime (20021040251).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20021040245 - 2⁴ = 20021040229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2252729 + ... + 2261598.

It is an arithmetic number, because the mean of its divisors is an integer number (3006542448).

Almost surely, 2^20021040245 is an apocalyptic number.

It is an amenable number.

20021040245 is a deficient number, since it is larger than the sum of its proper divisors (4031299339).

20021040245 is an equidigital number, since it uses as much as digits as its factorization.

20021040245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4515219.

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 20021040245 its reverse (54204012002), we get a palindrome (74225052247).

The spelling of 20021040245 in words is "twenty billion, twenty-one million, forty thousand, two hundred forty-five".