20266860 has 24 divisors (see below), whose sum is σ = 56747376. Its totient is φ = 5404480.

The previous prime is 20266849. The next prime is 20266867. The reversal of 20266860 is 6866202.

It is a super-2 number, since 2×20266860² = 821491228519200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (20266867) 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, 168831 + ... + 168950.

It is an arithmetic number, because the mean of its divisors is an integer number (2364474).

Almost surely, 2^20266860 is an apocalyptic number.

20266860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20266860 is an abundant number, since it is smaller than the sum of its proper divisors (36480516).

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

20266860 is a wasteful number, since it uses less digits than its factorization.

20266860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337793 (or 337791 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20266860 is about 4501.8729435647. The cubic root of 20266860 is about 272.6437139977.

The spelling of 20266860 in words is "twenty million, two hundred sixty-six thousand, eight hundred sixty".