20024215661 has 16 divisors (see below), whose sum is σ = 20554974720. Its totient is φ = 19502476800.

The previous prime is 20024215649. The next prime is 20024215693. The reversal of 20024215661 is 16651242002.

It is a cyclic number.

It is not a de Polignac number, because 20024215661 - 2¹⁴ = 20024199277 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 (20024215621) 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, 1629980 + ... + 1642218.

It is an arithmetic number, because the mean of its divisors is an integer number (1284685920).

Almost surely, 2^20024215661 is an apocalyptic number.

It is an amenable number.

20024215661 is a deficient number, since it is larger than the sum of its proper divisors (530759059).

20024215661 is a wasteful number, since it uses less digits than its factorization.

20024215661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12604.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 20024215661 its reverse (16651242002), we get a palindrome (36675457663).

The spelling of 20024215661 in words is "twenty billion, twenty-four million, two hundred fifteen thousand, six hundred sixty-one".