20420726 has 16 divisors (see below), whose sum is σ = 31672080. Its totient is φ = 9869280.

The previous prime is 20420681. The next prime is 20420759. The reversal of 20420726 is 62702402.

It is a congruent 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, 5780 + ... + 8616.

It is an arithmetic number, because the mean of its divisors is an integer number (1979505).

Almost surely, 2^20420726 is an apocalyptic number.

20420726 is a deficient number, since it is larger than the sum of its proper divisors (11251354).

20420726 is a wasteful number, since it uses less digits than its factorization.

20420726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2959.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 20420726 is about 4518.9297405470. The cubic root of 20420726 is about 273.3319455941.

The spelling of 20420726 in words is "twenty million, four hundred twenty thousand, seven hundred twenty-six".