20531040292 has 24 divisors (see below), whose sum is σ = 43223243840. Its totient is φ = 8335910880.

The previous prime is 20531040269. The next prime is 20531040293. The reversal of 20531040292 is 29204013502.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 20531040292.

It is not an unprimeable number, because it can be changed into a prime (20531040293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19295559 + ... + 19296622.

Almost surely, 2^20531040292 is an apocalyptic number.

It is an amenable number.

20531040292 is an abundant number, since it is smaller than the sum of its proper divisors (22692203548).

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

20531040292 is a wasteful number, since it uses less digits than its factorization.

20531040292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38592211 (or 38592209 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 20531040292 its reverse (29204013502), we get a palindrome (49735053794).

The spelling of 20531040292 in words is "twenty billion, five hundred thirty-one million, forty thousand, two hundred ninety-two".