20034515521 has 4 divisors (see below), whose sum is σ = 21213016452. Its totient is φ = 18856014592.

The previous prime is 20034515513. The next prime is 20034515573. The reversal of 20034515521 is 12551543002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15415953921 + 4618561600 = 124161^2 + 67960^2 .

It is a cyclic number.

It is not a de Polignac number, because 20034515521 - 2³ = 20034515513 is a prime.

It is a super-2 number, since 2×20034515521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20034515521.

It is not an unprimeable number, because it can be changed into a prime (20034515821) 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, 589250440 + ... + 589250473.

It is an arithmetic number, because the mean of its divisors is an integer number (5303254113).

Almost surely, 2^20034515521 is an apocalyptic number.

It is an amenable number.

20034515521 is a deficient number, since it is larger than the sum of its proper divisors (1178500931).

20034515521 is a wasteful number, since it uses less digits than its factorization.

20034515521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178500930.

The product of its (nonzero) digits is 6000, while the sum is 28.

The spelling of 20034515521 in words is "twenty billion, thirty-four million, five hundred fifteen thousand, five hundred twenty-one".