20420364 has 24 divisors (see below), whose sum is σ = 50155840. Its totient is φ = 6448464.

The previous prime is 20420359. The next prime is 20420371. The reversal of 20420364 is 46302402.

It is a self number, because there is not a number n which added to its sum of digits gives 20420364.

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 7 ways as a sum of consecutive naturals, for example, 44554 + ... + 45009.

Almost surely, 2^20420364 is an apocalyptic number.

It is an amenable number.

20420364 is an abundant number, since it is smaller than the sum of its proper divisors (29735476).

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

20420364 is a wasteful number, since it uses less digits than its factorization.

20420364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89589 (or 89587 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 20420364 is about 4518.8896866376. The cubic root of 20420364 is about 273.3303304581.

Adding to 20420364 its reverse (46302402), we get a palindrome (66722766).

The spelling of 20420364 in words is "twenty million, four hundred twenty thousand, three hundred sixty-four".