20435421005 has 8 divisors (see below), whose sum is σ = 24600853752. Its totient is φ = 16296104448.

The previous prime is 20435420989. The next prime is 20435421053. The reversal of 20435421005 is 50012453402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1474406404 + 18961014601 = 38398^2 + 137699^2 .

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 20435421005 - 2⁴ = 20435420989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6527324 + ... + 6530453.

It is an arithmetic number, because the mean of its divisors is an integer number (3075106719).

Almost surely, 2^20435421005 is an apocalyptic number.

It is an amenable number.

20435421005 is a deficient number, since it is larger than the sum of its proper divisors (4165432747).

20435421005 is a wasteful number, since it uses less digits than its factorization.

20435421005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13058095.

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 20435421005 its reverse (50012453402), we get a palindrome (70447874407).

The spelling of 20435421005 in words is "twenty billion, four hundred thirty-five million, four hundred twenty-one thousand, five".