20131551024 has 80 divisors (see below), whose sum is σ = 56350893312. Its totient is φ = 6156290304.

The previous prime is 20131551017. The next prime is 20131551043. The reversal of 20131551024 is 42015513102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 20131550985 and 20131551003.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2749 + ... + 200675.

Almost surely, 2^20131551024 is an apocalyptic number.

20131551024 is a gapful number since it is divisible by the number (24) 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 20131551024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28175446656).

20131551024 is an abundant number, since it is smaller than the sum of its proper divisors (36219342288).

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

20131551024 is a wasteful number, since it uses less digits than its factorization.

20131551024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198114 (or 198108 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 20131551024 in words is "twenty billion, one hundred thirty-one million, five hundred fifty-one thousand, twenty-four".