20505404034 has 24 divisors (see below), whose sum is σ = 44752675500. Its totient is φ = 6785242368.

The previous prime is 20505403993. The next prime is 20505404093. The reversal of 20505404034 is 43040450502.

20505404034 is a `hidden beast` number, since 2 + 0 + 50 + 540 + 40 + 34 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19880154009 + 625250025 = 140997^2 + 25005^2 .

It is a super-3 number, since 3×20505404034³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20505403989 and 20505404007.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4155159 + ... + 4160090.

Almost surely, 2^20505404034 is an apocalyptic number.

20505404034 is an abundant number, since it is smaller than the sum of its proper divisors (24247271466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20505404034 is a wasteful number, since it uses less digits than its factorization.

20505404034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8315394 (or 8315391 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

Adding to 20505404034 its reverse (43040450502), we get a palindrome (63545854536).

The spelling of 20505404034 in words is "twenty billion, five hundred five million, four hundred four thousand, thirty-four".