20923517439 has 24 divisors (see below), whose sum is σ = 33296846544. Its totient is φ = 12555360000.

The previous prime is 20923517437. The next prime is 20923517443. The reversal of 20923517439 is 93471532902.

20923517439 is a `hidden beast` number, since 2 + 0 + 92 + 3 + 517 + 43 + 9 = 666.

It is not a de Polignac number, because 20923517439 - 2¹ = 20923517437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20923517394 and 20923517403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20923517437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1036282 + ... + 1056279.

It is an arithmetic number, because the mean of its divisors is an integer number (1387368606).

Almost surely, 2^20923517439 is an apocalyptic number.

20923517439 is a deficient number, since it is larger than the sum of its proper divisors (12373329105).

20923517439 is a wasteful number, since it uses less digits than its factorization.

20923517439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2092679 (or 2092676 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 20923517439 in words is "twenty billion, nine hundred twenty-three million, five hundred seventeen thousand, four hundred thirty-nine".