20858070 has 16 divisors (see below), whose sum is σ = 50059440. Its totient is φ = 5562144.

The previous prime is 20858069. The next prime is 20858077. The reversal of 20858070 is 7085802.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 695269 = 20858070 / (2 + 0 + 8 + 5 + 8 + 0 + 7 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20858077) 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 7 ways as a sum of consecutive naturals, for example, 347605 + ... + 347664.

It is an arithmetic number, because the mean of its divisors is an integer number (3128715).

Almost surely, 2^20858070 is an apocalyptic number.

20858070 is an abundant number, since it is smaller than the sum of its proper divisors (29201370).

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

20858070 is a wasteful number, since it uses less digits than its factorization.

20858070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695279.

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 20858070 is about 4567.0636080528. The cubic root of 20858070 is about 275.2694658981.

The spelling of 20858070 in words is "twenty million, eight hundred fifty-eight thousand, seventy".