20858502 has 16 divisors (see below), whose sum is σ = 47676672. Its totient is φ = 5959560.

The previous prime is 20858489. The next prime is 20858503. The reversal of 20858502 is 20585802.

It is a self number, because there is not a number n which added to its sum of digits gives 20858502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20858503) 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, 248274 + ... + 248357.

It is an arithmetic number, because the mean of its divisors is an integer number (2979792).

Almost surely, 2^20858502 is an apocalyptic number.

20858502 is an abundant number, since it is smaller than the sum of its proper divisors (26818170).

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

20858502 is a wasteful number, since it uses less digits than its factorization.

20858502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496643.

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 20858502 is about 4567.1109029670. The cubic root of 20858502 is about 275.2713662911.

The spelling of 20858502 in words is "twenty million, eight hundred fifty-eight thousand, five hundred two".