20356671431 has 4 divisors (see below), whose sum is σ = 20360923392. Its totient is φ = 20352419472.

The previous prime is 20356671397. The next prime is 20356671469. The reversal of 20356671431 is 13417665302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13417665302 = 2 ⋅6708832651.

It is a cyclic number.

It is not a de Polignac number, because 20356671431 - 2¹⁰ = 20356670407 is a prime.

It is a super-2 number, since 2×20356671431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20356671031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2118791 + ... + 2128376.

It is an arithmetic number, because the mean of its divisors is an integer number (5090230848).

Almost surely, 2^20356671431 is an apocalyptic number.

20356671431 is a deficient number, since it is larger than the sum of its proper divisors (4251961).

20356671431 is an equidigital number, since it uses as much as digits as its factorization.

20356671431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4251960.

The product of its (nonzero) digits is 90720, while the sum is 38.

The spelling of 20356671431 in words is "twenty billion, three hundred fifty-six million, six hundred seventy-one thousand, four hundred thirty-one".