20424332021 has 8 divisors (see below), whose sum is σ = 20783528640. Its totient is φ = 20065569568.

The previous prime is 20424331969. The next prime is 20424332023. The reversal of 20424332021 is 12023342402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20424332021 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 (20424332023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12896 + ... + 202521.

It is an arithmetic number, because the mean of its divisors is an integer number (2597941080).

Almost surely, 2^20424332021 is an apocalyptic number.

It is an amenable number.

20424332021 is a deficient number, since it is larger than the sum of its proper divisors (359196619).

20424332021 is a wasteful number, since it uses less digits than its factorization.

20424332021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217083.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 20424332021 its reverse (12023342402), we get a palindrome (32447674423).

The spelling of 20424332021 in words is "twenty billion, four hundred twenty-four million, three hundred thirty-two thousand, twenty-one".