20423354986 has 8 divisors (see below), whose sum is σ = 30703263300. Its totient is φ = 10188933888.

The previous prime is 20423354971. The next prime is 20423354989. The reversal of 20423354986 is 68945332402.

It can be written as a sum of positive squares in 2 ways, for example, as 19591320961 + 832034025 = 139969^2 + 28845^2 .

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

It is a super-2 number, since 2×20423354986² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20423354989) 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, 11370681 + ... + 11372476.

Almost surely, 2^20423354986 is an apocalyptic number.

20423354986 is a deficient number, since it is larger than the sum of its proper divisors (10279908314).

20423354986 is a wasteful number, since it uses less digits than its factorization.

20423354986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22743608.

The product of its (nonzero) digits is 1244160, while the sum is 46.

The spelling of 20423354986 in words is "twenty billion, four hundred twenty-three million, three hundred fifty-four thousand, nine hundred eighty-six".