20631078 has 32 divisors (see below), whose sum is σ = 49375200. Its totient is φ = 6347808.

The previous prime is 20631043. The next prime is 20631097. The reversal of 20631078 is 87013602.

20631078 is a `hidden beast` number, since 20 + 631 + 0 + 7 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 15 ways as a sum of consecutive naturals, for example, 13993 + ... + 15396.

It is an arithmetic number, because the mean of its divisors is an integer number (1542975).

Almost surely, 2^20631078 is an apocalyptic number.

20631078 is an abundant number, since it is smaller than the sum of its proper divisors (28744122).

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

20631078 is a wasteful number, since it uses less digits than its factorization.

20631078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29413 (or 29407 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20631078 is about 4542.1446476307. The cubic root of 20631078 is about 274.2672636864.

The spelling of 20631078 in words is "twenty million, six hundred thirty-one thousand, seventy-eight".