20105078 has 16 divisors (see below), whose sum is σ = 36280320. Its totient is φ = 8162856.

The previous prime is 20105053. The next prime is 20105087. The reversal of 20105078 is 87050102.

It is a super-2 number, since 2×20105078² = 808428322772168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37526 + ... + 38057.

It is an arithmetic number, because the mean of its divisors is an integer number (2267520).

Almost surely, 2^20105078 is an apocalyptic number.

20105078 is a deficient number, since it is larger than the sum of its proper divisors (16175242).

20105078 is a wasteful number, since it uses less digits than its factorization.

20105078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75611.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 20105078 is about 4483.8686421437. The cubic root of 20105078 is about 271.9163075123.

The spelling of 20105078 in words is "twenty million, one hundred five thousand, seventy-eight".