20531551040 has 336 divisors, whose sum is σ = 66152182656. Its totient is φ = 5906165760.

The previous prime is 20531551037. The next prime is 20531551057. The reversal of 20531551040 is 4015513502.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3520607 + ... + 3526433.

It is an arithmetic number, because the mean of its divisors is an integer number (196881496).

Almost surely, 2^20531551040 is an apocalyptic number.

20531551040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20531551040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33076091328).

20531551040 is an abundant number, since it is smaller than the sum of its proper divisors (45620631616).

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

20531551040 is a wasteful number, since it uses less digits than its factorization.

20531551040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5886 (or 5865 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 20531551040 in words is "twenty billion, five hundred thirty-one million, five hundred fifty-one thousand, forty".