20725642 has 16 divisors (see below), whose sum is σ = 35591040. Its totient is φ = 8867088.

The previous prime is 20725631. The next prime is 20725667. The reversal of 20725642 is 24652702.

It is a self number, because there is not a number n which added to its sum of digits gives 20725642.

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, 11584 + ... + 13252.

It is an arithmetic number, because the mean of its divisors is an integer number (2224440).

Almost surely, 2^20725642 is an apocalyptic number.

20725642 is a deficient number, since it is larger than the sum of its proper divisors (14865398).

20725642 is a wasteful number, since it uses less digits than its factorization.

20725642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2565.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 20725642 is about 4552.5423666343. The cubic root of 20725642 is about 274.6856661876.

The spelling of 20725642 in words is "twenty million, seven hundred twenty-five thousand, six hundred forty-two".