20143878 has 24 divisors (see below), whose sum is σ = 42800712. Its totient is φ = 6319104.

The previous prime is 20143867. The next prime is 20143889. The reversal of 20143878 is 87834102.

It is an interprime number because it is at equal distance from previous prime (20143867) and next prime (20143889).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4075 + ... + 7542.

It is an arithmetic number, because the mean of its divisors is an integer number (1783363).

Almost surely, 2^20143878 is an apocalyptic number.

20143878 is an abundant number, since it is smaller than the sum of its proper divisors (22656834).

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

20143878 is a wasteful number, since it uses less digits than its factorization.

20143878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11656 (or 11639 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 20143878 is about 4488.1931776607. The cubic root of 20143878 is about 272.0911153079.

The spelling of 20143878 in words is "twenty million, one hundred forty-three thousand, eight hundred seventy-eight".