20578140 has 144 divisors (see below), whose sum is σ = 71809920. Its totient is φ = 4717440.

The previous prime is 20578127. The next prime is 20578183. The reversal of 20578140 is 4187502.

20578140 = 189³ + 190³ + 191³.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37347 + ... + 37893.

It is an arithmetic number, because the mean of its divisors is an integer number (498680).

Almost surely, 2^20578140 is an apocalyptic number.

20578140 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 20578140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35904960).

20578140 is an abundant number, since it is smaller than the sum of its proper divisors (51231780).

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

20578140 is a wasteful number, since it uses less digits than its factorization.

20578140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592 (or 587 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20578140 is about 4536.3134812312. The cubic root of 20578140 is about 274.0324787898.

The spelling of 20578140 in words is "twenty million, five hundred seventy-eight thousand, one hundred forty".