20013228431 has 8 divisors (see below), whose sum is σ = 23404174464. Its totient is φ = 16755260760.

The previous prime is 20013228421. The next prime is 20013228439. The reversal of 20013228431 is 13482231002.

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

It is not a de Polignac number, because 20013228431 - 2¹⁴ = 20013212047 is a prime.

It is a super-2 number, since 2×20013228431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20013228431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013228439) 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, 33244265 + ... + 33244866.

It is an arithmetic number, because the mean of its divisors is an integer number (2925521808).

Almost surely, 2^20013228431 is an apocalyptic number.

20013228431 is a deficient number, since it is larger than the sum of its proper divisors (3390946033).

20013228431 is an equidigital number, since it uses as much as digits as its factorization.

20013228431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66489181.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 20013228431 its reverse (13482231002), we get a palindrome (33495459433).

The spelling of 20013228431 in words is "twenty billion, thirteen million, two hundred twenty-eight thousand, four hundred thirty-one".