20155600542 has 64 divisors (see below), whose sum is σ = 50363596800. Its totient is φ = 5224234080.

The previous prime is 20155600519. The next prime is 20155600559. The reversal of 20155600542 is 24500655102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175759 + ... + 266837.

It is an arithmetic number, because the mean of its divisors is an integer number (786931200).

Almost surely, 2^20155600542 is an apocalyptic number.

20155600542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20155600542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25181798400).

20155600542 is an abundant number, since it is smaller than the sum of its proper divisors (30207996258).

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

20155600542 is a wasteful number, since it uses less digits than its factorization.

20155600542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91581.

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 20155600542 in words is "twenty billion, one hundred fifty-five million, six hundred thousand, five hundred forty-two".