20258478 has 16 divisors (see below), whose sum is σ = 45018960. Its totient is φ = 6752808.

The previous prime is 20258477. The next prime is 20258507. The reversal of 20258478 is 87485202.

It is a happy number.

20258478 is a `hidden beast` number, since 2 + 0 + 2 + 584 + 78 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20258471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187525 + ... + 187632.

It is an arithmetic number, because the mean of its divisors is an integer number (2813685).

Almost surely, 2^20258478 is an apocalyptic number.

20258478 is an abundant number, since it is smaller than the sum of its proper divisors (24760482).

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

20258478 is a wasteful number, since it uses less digits than its factorization.

20258478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375168 (or 375162 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 20258478 is about 4500.9419014246. The cubic root of 20258478 is about 272.6061220087.

It can be divided in two parts, 20258 and 478, that added together give a 4-th power (20736 = 12⁴).

The spelling of 20258478 in words is "twenty million, two hundred fifty-eight thousand, four hundred seventy-eight".