20420043 has 32 divisors (see below), whose sum is σ = 33675264. Its totient is φ = 10739712.

The previous prime is 20420033. The next prime is 20420051. The reversal of 20420043 is 34002402.

It is a happy number.

It is not a de Polignac number, because 20420043 - 2⁴ = 20420027 is a prime.

It is a super-2 number, since 2×20420043² = 833956312243698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20420033) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16171 + ... + 17387.

It is an arithmetic number, because the mean of its divisors is an integer number (1052352).

Almost surely, 2^20420043 is an apocalyptic number.

20420043 is a deficient number, since it is larger than the sum of its proper divisors (13255221).

20420043 is a wasteful number, since it uses less digits than its factorization.

20420043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291.

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 20420043 is about 4518.8541689238. The cubic root of 20420043 is about 273.3288982359.

Adding to 20420043 its reverse (34002402), we get a palindrome (54422445).

The spelling of 20420043 in words is "twenty million, four hundred twenty thousand, forty-three".