20725442 has 8 divisors (see below), whose sum is σ = 31110156. Its totient is φ = 10355392.

The previous prime is 20725427. The next prime is 20725451. The reversal of 20725442 is 24452702.

It can be written as a sum of positive squares in 2 ways, for example, as 20693401 + 32041 = 4549^2 + 179^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1118 + ... + 6534.

Almost surely, 2^20725442 is an apocalyptic number.

20725442 is a deficient number, since it is larger than the sum of its proper divisors (10384714).

20725442 is a wasteful number, since it uses less digits than its factorization.

20725442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7332.

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 20725442 is about 4552.5204008329. The cubic root of 20725442 is about 274.6847826234.

The spelling of 20725442 in words is "twenty million, seven hundred twenty-five thousand, four hundred forty-two".