20420584 has 32 divisors (see below), whose sum is σ = 39168000. Its totient is φ = 9979200.

The previous prime is 20420579. The next prime is 20420591. The reversal of 20420584 is 48502402.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102517 + ... + 102715.

It is an arithmetic number, because the mean of its divisors is an integer number (1224000).

Almost surely, 2^20420584 is an apocalyptic number.

It is an amenable number.

20420584 is a deficient number, since it is larger than the sum of its proper divisors (18747416).

20420584 is a wasteful number, since it uses less digits than its factorization.

20420584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 20420584 is about 4518.9140288348. The cubic root of 20420584 is about 273.3313120348.

Adding to 20420584 its reverse (48502402), we get a palindrome (68922986).

The spelling of 20420584 in words is "twenty million, four hundred twenty thousand, five hundred eighty-four".