20434720 has 24 divisors (see below), whose sum is σ = 48277404. Its totient is φ = 8173824.

The previous prime is 20434703. The next prime is 20434759. The reversal of 20434720 is 2743402.

It can be written as a sum of positive squares in 2 ways, for example, as 19749136 + 685584 = 4444^2 + 828^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20434691 and 20434700.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 63699 + ... + 64018.

Almost surely, 2^20434720 is an apocalyptic number.

20434720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20434720 is an abundant number, since it is smaller than the sum of its proper divisors (27842684).

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

20434720 is a wasteful number, since it uses less digits than its factorization.

20434720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127732 (or 127724 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 22.

The square root of 20434720 is about 4520.4778508472. The cubic root of 20434720 is about 273.3943680212.

The spelling of 20434720 in words is "twenty million, four hundred thirty-four thousand, seven hundred twenty".