20159040 has 224 divisors, whose sum is σ = 73737216. Its totient is φ = 4618240.

The previous prime is 20159033. The next prime is 20159047. The reversal of 20159040 is 4095102.

It is an interprime number because it is at equal distance from previous prime (20159033) and next prime (20159047).

It is a junction number, because it is equal to n+sod(n) for n = 20158998 and 20159016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20159047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 242839 + ... + 242921.

It is an arithmetic number, because the mean of its divisors is an integer number (329184).

Almost surely, 2^20159040 is an apocalyptic number.

20159040 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 20159040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36868608).

20159040 is an abundant number, since it is smaller than the sum of its proper divisors (53578176).

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

20159040 is a wasteful number, since it uses less digits than its factorization.

20159040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20159040 is about 4489.8819583593. The cubic root of 20159040 is about 272.1593645111.

The spelling of 20159040 in words is "twenty million, one hundred fifty-nine thousand, forty".