20431127405 has 48 divisors (see below), whose sum is σ = 28420632000. Its totient is φ = 14050603008.

The previous prime is 20431127399. The next prime is 20431127411. The reversal of 20431127405 is 50472113402.

It is an interprime number because it is at equal distance from previous prime (20431127399) and next prime (20431127411).

It is not a de Polignac number, because 20431127405 - 2⁴ = 20431127389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 936461 + ... + 958029.

It is an arithmetic number, because the mean of its divisors is an integer number (592096500).

Almost surely, 2^20431127405 is an apocalyptic number.

It is an amenable number.

20431127405 is a deficient number, since it is larger than the sum of its proper divisors (7989504595).

20431127405 is a wasteful number, since it uses less digits than its factorization.

20431127405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21678 (or 21665 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The spelling of 20431127405 in words is "twenty billion, four hundred thirty-one million, one hundred twenty-seven thousand, four hundred five".