20420544 has 28 divisors (see below), whose sum is σ = 54029864. Its totient is φ = 6806784.

The previous prime is 20420531. The next prime is 20420557. The reversal of 20420544 is 44502402.

It is an interprime number because it is at equal distance from previous prime (20420531) and next prime (20420557).

It is a self number, because there is not a number n which added to its sum of digits gives 20420544.

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, 52987 + ... + 53370.

It is an arithmetic number, because the mean of its divisors is an integer number (1929638).

Almost surely, 2^20420544 is an apocalyptic number.

20420544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20420544 is an abundant number, since it is smaller than the sum of its proper divisors (33609320).

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

20420544 is a wasteful number, since it uses less digits than its factorization.

20420544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106372 (or 106362 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 20420544 is about 4518.9096029905. The cubic root of 20420544 is about 273.3311335668.

Adding to 20420544 its reverse (44502402), we get a palindrome (64922946).

The spelling of 20420544 in words is "twenty million, four hundred twenty thousand, five hundred forty-four".