20670258 has 48 divisors (see below), whose sum is σ = 48492864. Its totient is φ = 5856480.

The previous prime is 20670241. The next prime is 20670259. The reversal of 20670258 is 85207602.

It is not an unprimeable number, because it can be changed into a prime (20670259) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48888 + ... + 49308.

It is an arithmetic number, because the mean of its divisors is an integer number (1010268).

Almost surely, 2^20670258 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20670258, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24246432).

20670258 is an abundant number, since it is smaller than the sum of its proper divisors (27822606).

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

20670258 is a wasteful number, since it uses less digits than its factorization.

20670258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607 (or 600 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 20670258 is about 4546.4555425078. The cubic root of 20670258 is about 274.4407720895.

The spelling of 20670258 in words is "twenty million, six hundred seventy thousand, two hundred fifty-eight".