20078971 has 12 divisors (see below), whose sum is σ = 22545432. Its totient is φ = 17724000.

The previous prime is 20078969. The next prime is 20078987. The reversal of 20078971 is 17987002.

20078971 = T₄₃ + T₄₄ + ... + T₄₉₃.

It is not a de Polignac number, because 20078971 - 2¹ = 20078969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20078941) by changing a digit.

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, 95056 + ... + 95266.

It is an arithmetic number, because the mean of its divisors is an integer number (1878786).

Almost surely, 2^20078971 is an apocalyptic number.

20078971 is a deficient number, since it is larger than the sum of its proper divisors (2466461).

20078971 is an equidigital number, since it uses as much as digits as its factorization.

20078971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474 (or 263 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 20078971 is about 4480.9564827166. The cubic root of 20078971 is about 271.7985595819.

The spelling of 20078971 in words is "twenty million, seventy-eight thousand, nine hundred seventy-one".