20420706 has 64 divisors (see below), whose sum is σ = 46811520. Its totient is φ = 5898240.

The previous prime is 20420681. The next prime is 20420759. The reversal of 20420706 is 60702402.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79330 + ... + 79586.

It is an arithmetic number, because the mean of its divisors is an integer number (731430).

Almost surely, 2^20420706 is an apocalyptic number.

20420706 is an abundant number, since it is smaller than the sum of its proper divisors (26390814).

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

20420706 is a wasteful number, since it uses less digits than its factorization.

20420706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20420706 is about 4518.9275276331. The cubic root of 20420706 is about 273.3318563606.

It can be divided in two parts, 204 and 20706, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 20420706 in words is "twenty million, four hundred twenty thousand, seven hundred six".