20177982 has 48 divisors (see below), whose sum is σ = 48213360. Its totient is φ = 6048000.

The previous prime is 20177977. The next prime is 20177999. The reversal of 20177982 is 28977102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19494 + ... + 20502.

It is an arithmetic number, because the mean of its divisors is an integer number (1004445).

Almost surely, 2^20177982 is an apocalyptic number.

20177982 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 20177982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24106680).

20177982 is an abundant number, since it is smaller than the sum of its proper divisors (28035378).

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

20177982 is a wasteful number, since it uses less digits than its factorization.

20177982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129 (or 1126 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 20177982 is about 4491.9908726532. The cubic root of 20177982 is about 272.2445806863.

It can be divided in two parts, 2017 and 7982, that added together give a palindrome (9999).

The spelling of 20177982 in words is "twenty million, one hundred seventy-seven thousand, nine hundred eighty-two".