20810385 has 32 divisors (see below), whose sum is σ = 37296000. Its totient is φ = 11009088.

The previous prime is 20810369. The next prime is 20810399. The reversal of 20810385 is 58301802.

It is a happy number.

It is not a de Polignac number, because 20810385 - 2⁴ = 20810369 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18211 + ... + 19319.

It is an arithmetic number, because the mean of its divisors is an integer number (1165500).

Almost surely, 2^20810385 is an apocalyptic number.

It is an amenable number.

20810385 is a deficient number, since it is larger than the sum of its proper divisors (16485615).

20810385 is a wasteful number, since it uses less digits than its factorization.

20810385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262 (or 1256 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 20810385 is about 4561.8400892622. The cubic root of 20810385 is about 275.0595353195.

The spelling of 20810385 in words is "twenty million, eight hundred ten thousand, three hundred eighty-five".