20712403 has 2 divisors, whose sum is σ = 20712404. Its totient is φ = 20712402.

The previous prime is 20712353. The next prime is 20712431. The reversal of 20712403 is 30421702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20712403 - 2²¹ = 18615251 is a prime.

It is not a weakly prime, because it can be changed into another prime (20712473) by changing a digit.

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 as a sum of consecutive naturals, namely, 10356201 + 10356202.

It is an arithmetic number, because the mean of its divisors is an integer number (10356202).

Almost surely, 2^20712403 is an apocalyptic number.

20712403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20712403 is an equidigital number, since it uses as much as digits as its factorization.

20712403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20712403 is about 4551.0881116498. The cubic root of 20712403 is about 274.6271663814.

It can be divided in two parts, 20712 and 403, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20712403 in words is "twenty million, seven hundred twelve thousand, four hundred three".