20420441431 has 4 divisors (see below), whose sum is σ = 21991244632. Its totient is φ = 18849638232.

The previous prime is 20420441413. The next prime is 20420441449. The reversal of 20420441431 is 13414402402.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20420441413) and next prime (20420441449).

It is a cyclic number.

It is not a de Polignac number, because 20420441431 - 2⁵ = 20420441399 is a prime.

It is a super-2 number, since 2×20420441431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20420441396 and 20420441405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420441131) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 785401581 + ... + 785401606.

It is an arithmetic number, because the mean of its divisors is an integer number (5497811158).

Almost surely, 2^20420441431 is an apocalyptic number.

20420441431 is a deficient number, since it is larger than the sum of its proper divisors (1570803201).

20420441431 is a wasteful number, since it uses less digits than its factorization.

20420441431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570803200.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 20420441431 its reverse (13414402402), we get a palindrome (33834843833).

The spelling of 20420441431 in words is "twenty billion, four hundred twenty million, four hundred forty-one thousand, four hundred thirty-one".