20420029 has 4 divisors (see below), whose sum is σ = 23337184. Its totient is φ = 17502876.

The previous prime is 20420027. The next prime is 20420033. The reversal of 20420029 is 92002402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20420029 - 2¹ = 20420027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20419988 and 20420015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1458567 + ... + 1458580.

It is an arithmetic number, because the mean of its divisors is an integer number (5834296).

Almost surely, 2^20420029 is an apocalyptic number.

It is an amenable number.

20420029 is a deficient number, since it is larger than the sum of its proper divisors (2917155).

20420029 is an equidigital number, since it uses as much as digits as its factorization.

20420029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2917154.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20420029 is about 4518.8526198583. The cubic root of 20420029 is about 273.3288357711.

The spelling of 20420029 in words is "twenty million, four hundred twenty thousand, twenty-nine".