20011021431 has 8 divisors (see below), whose sum is σ = 26684845824. Its totient is φ = 13338939000.

The previous prime is 20011021421. The next prime is 20011021439. The reversal of 20011021431 is 13412011002.

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

It is not a de Polignac number, because 20011021431 - 2⁶ = 20011021367 is a prime.

It is a super-2 number, since 2×20011021431² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20011021431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011021439) 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, 408445 + ... + 454806.

It is an arithmetic number, because the mean of its divisors is an integer number (3335605728).

Almost surely, 2^20011021431 is an apocalyptic number.

20011021431 is a deficient number, since it is larger than the sum of its proper divisors (6673824393).

20011021431 is an equidigital number, since it uses as much as digits as its factorization.

20011021431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870981.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20011021431 its reverse (13412011002), we get a palindrome (33423032433).

The spelling of 20011021431 in words is "twenty billion, eleven million, twenty-one thousand, four hundred thirty-one".