20952457 has 2 divisors, whose sum is σ = 20952458. Its totient is φ = 20952456.

The previous prime is 20952433. The next prime is 20952461. The reversal of 20952457 is 75425902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20620681 + 331776 = 4541^2 + 576^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20952457 is a prime.

It is not a weakly prime, because it can be changed into another prime (20952467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10476228 + 10476229.

It is an arithmetic number, because the mean of its divisors is an integer number (10476229).

Almost surely, 2^20952457 is an apocalyptic number.

It is an amenable number.

20952457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20952457 is an equidigital number, since it uses as much as digits as its factorization.

20952457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 20952457 is about 4577.3853890622. The cubic root of 20952457 is about 275.6840578881.

It can be divided in two parts, 2095 and 2457, that multiplied together give a palindrome (5147415).

The spelling of 20952457 in words is "twenty million, nine hundred fifty-two thousand, four hundred fifty-seven".