20810420 has 12 divisors (see below), whose sum is σ = 43701924. Its totient is φ = 8324160.

The previous prime is 20810407. The next prime is 20810443. The reversal of 20810420 is 2401802.

It can be written as a sum of positive squares in 2 ways, for example, as 16467364 + 4343056 = 4058^2 + 2084^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 520241 + ... + 520280.

It is an arithmetic number, because the mean of its divisors is an integer number (3641827).

Almost surely, 2^20810420 is an apocalyptic number.

20810420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20810420 is an abundant number, since it is smaller than the sum of its proper divisors (22891504).

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

20810420 is a wasteful number, since it uses less digits than its factorization.

20810420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040530 (or 1040528 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 20810420 is about 4561.8439254319. The cubic root of 20810420 is about 275.0596895226.

The spelling of 20810420 in words is "twenty million, eight hundred ten thousand, four hundred twenty".