20713457 has 2 divisors, whose sum is σ = 20713458. Its totient is φ = 20713456.

The previous prime is 20713447. The next prime is 20713489. The reversal of 20713457 is 75431702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10784656 + 9928801 = 3284^2 + 3151^2 .

It is a cyclic number.

It is not a de Polignac number, because 20713457 - 2⁶ = 20713393 is a prime.

It is not a weakly prime, because it can be changed into another prime (20713447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10356728 + 10356729.

It is an arithmetic number, because the mean of its divisors is an integer number (10356729).

Almost surely, 2^20713457 is an apocalyptic number.

It is an amenable number.

20713457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20713457 is an equidigital number, since it uses as much as digits as its factorization.

20713457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 20713457 is about 4551.2039066603. The cubic root of 20713457 is about 274.6318246550.

The spelling of 20713457 in words is "twenty million, seven hundred thirteen thousand, four hundred fifty-seven".