20420697 has 16 divisors (see below), whose sum is σ = 29803968. Its totient is φ = 12334080.

The previous prime is 20420681. The next prime is 20420759. The reversal of 20420697 is 79602402.

It is a happy number.

It is not a de Polignac number, because 20420697 - 2⁴ = 20420681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20420627) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10773 + ... + 12525.

It is an arithmetic number, because the mean of its divisors is an integer number (1862748).

Almost surely, 2^20420697 is an apocalyptic number.

It is an amenable number.

20420697 is a deficient number, since it is larger than the sum of its proper divisors (9383271).

20420697 is a wasteful number, since it uses less digits than its factorization.

20420697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 20420697 is about 4518.9265318215. The cubic root of 20420697 is about 273.3318162055.

The spelling of 20420697 in words is "twenty million, four hundred twenty thousand, six hundred ninety-seven".