20157015840 has 192 divisors, whose sum is σ = 68457312000. Its totient is φ = 4956033024.

The previous prime is 20157015803. The next prime is 20157015841. The reversal of 20157015840 is 4851075102.

It is not an unprimeable number, because it can be changed into a prime (20157015841) 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, 8728606 + ... + 8730914.

It is an arithmetic number, because the mean of its divisors is an integer number (356548500).

Almost surely, 2^20157015840 is an apocalyptic number.

20157015840 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 20157015840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34228656000).

20157015840 is an abundant number, since it is smaller than the sum of its proper divisors (48300296160).

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

20157015840 is a wasteful number, since it uses less digits than its factorization.

20157015840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3739 (or 3731 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 33.

The spelling of 20157015840 in words is "twenty billion, one hundred fifty-seven million, fifteen thousand, eight hundred forty".