20423543251 has 8 divisors (see below), whose sum is σ = 21518598800. Its totient is φ = 19330500960.

The previous prime is 20423543237. The next prime is 20423543267. The reversal of 20423543251 is 15234532402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20423543251 - 2¹³ = 20423535059 is a prime.

It is a super-2 number, since 2×20423543251² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20423343251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482460 + ... + 523081.

It is an arithmetic number, because the mean of its divisors is an integer number (2689824850).

Almost surely, 2^20423543251 is an apocalyptic number.

20423543251 is a deficient number, since it is larger than the sum of its proper divisors (1095055549).

20423543251 is a wasteful number, since it uses less digits than its factorization.

20423543251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006629.

The product of its (nonzero) digits is 28800, while the sum is 31.

The spelling of 20423543251 in words is "twenty billion, four hundred twenty-three million, five hundred forty-three thousand, two hundred fifty-one".