20177857287940 has 144 divisors (see below), whose sum is σ = 46697097404160. Its totient is φ = 7318324710400.

The previous prime is 20177857287937. The next prime is 20177857287961. The reversal of 20177857287940 is 4978275877102.

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, 1532915799 + ... + 1532928961.

It is an arithmetic number, because the mean of its divisors is an integer number (324285398640).

Almost surely, 2^{20177857287940} is an apocalyptic number.

20177857287940 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 20177857287940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23348548702080).

20177857287940 is an abundant number, since it is smaller than the sum of its proper divisors (26519240116220).

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

20177857287940 is a wasteful number, since it uses less digits than its factorization.

20177857287940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14794 (or 14781 counting only the distinct ones).

The product of its (nonzero) digits is 110638080, while the sum is 67.

The spelling of 20177857287940 in words is "twenty trillion, one hundred seventy-seven billion, eight hundred fifty-seven million, two hundred eighty-seven thousand, nine hundred forty".