20558070 has 64 divisors (see below), whose sum is σ = 59048640. Its totient is φ = 5059584.

The previous prime is 20558059. The next prime is 20558077. The reversal of 20558070 is 7085502.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20558077) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 582 + ... + 6438.

It is an arithmetic number, because the mean of its divisors is an integer number (922635).

Almost surely, 2^20558070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20558070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29524320).

20558070 is an abundant number, since it is smaller than the sum of its proper divisors (38490570).

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

20558070 is a wasteful number, since it uses less digits than its factorization.

20558070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5886 (or 5880 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 20558070 is about 4534.1007928805. The cubic root of 20558070 is about 273.9433612306.

The spelling of 20558070 in words is "twenty million, five hundred fifty-eight thousand, seventy".