20431527623 has 4 divisors (see below), whose sum is σ = 22003183608. Its totient is φ = 18859871640.

The previous prime is 20431527553. The next prime is 20431527637. The reversal of 20431527623 is 32672513402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32672513402 = 2 ⋅16336256701.

It is a cyclic number.

It is not a de Polignac number, because 20431527623 - 2¹⁴ = 20431511239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431527023) 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, 785827973 + ... + 785827998.

It is an arithmetic number, because the mean of its divisors is an integer number (5500795902).

Almost surely, 2^20431527623 is an apocalyptic number.

20431527623 is a deficient number, since it is larger than the sum of its proper divisors (1571655985).

20431527623 is a wasteful number, since it uses less digits than its factorization.

20431527623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571655984.

The product of its (nonzero) digits is 60480, while the sum is 35.

The spelling of 20431527623 in words is "twenty billion, four hundred thirty-one million, five hundred twenty-seven thousand, six hundred twenty-three".