20725403 has 2 divisors, whose sum is σ = 20725404. Its totient is φ = 20725402.

The previous prime is 20725387. The next prime is 20725427. The reversal of 20725403 is 30452702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20725403 - 2⁴ = 20725387 is a prime.

It is not a weakly prime, because it can be changed into another prime (20725483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10362701 + 10362702.

It is an arithmetic number, because the mean of its divisors is an integer number (10362702).

Almost surely, 2^20725403 is an apocalyptic number.

20725403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20725403 is an equidigital number, since it uses as much as digits as its factorization.

20725403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 20725403 is about 4552.5161174893. The cubic root of 20725403 is about 274.6846103277.

The spelling of 20725403 in words is "twenty million, seven hundred twenty-five thousand, four hundred three".