20043215531 has 8 divisors (see below), whose sum is σ = 20305236480. Its totient is φ = 19781402472.

The previous prime is 20043215461. The next prime is 20043215627. The reversal of 20043215531 is 13551234002.

It is a happy number.

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 20043215531 - 2¹⁸ = 20042953387 is a prime.

It is a super-2 number, since 2×20043215531² (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 20043215531.

It is not an unprimeable number, because it can be changed into a prime (20043215131) 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, 147056 + ... + 248418.

It is an arithmetic number, because the mean of its divisors is an integer number (2538154560).

Almost surely, 2^20043215531 is an apocalyptic number.

20043215531 is a deficient number, since it is larger than the sum of its proper divisors (262020949).

20043215531 is a wasteful number, since it uses less digits than its factorization.

20043215531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103945.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 20043215531 its reverse (13551234002), we get a palindrome (33594449533).

The spelling of 20043215531 in words is "twenty billion, forty-three million, two hundred fifteen thousand, five hundred thirty-one".