20700949 has 2 divisors, whose sum is σ = 20700950. Its totient is φ = 20700948.

The previous prime is 20700929. The next prime is 20700961. The reversal of 20700949 is 94900702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13176900 + 7524049 = 3630^2 + 2743^2 .

It is a cyclic number.

It is not a de Polignac number, because 20700949 - 2¹⁷ = 20569877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20700949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20700929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10350474 + 10350475.

It is an arithmetic number, because the mean of its divisors is an integer number (10350475).

Almost surely, 2^20700949 is an apocalyptic number.

It is an amenable number.

20700949 is a deficient number, since it is larger than the sum of its proper divisors (1).

20700949 is an equidigital number, since it uses as much as digits as its factorization.

20700949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 20700949 is about 4549.8295572472. The cubic root of 20700949 is about 274.5765339241.

The spelling of 20700949 in words is "twenty million, seven hundred thousand, nine hundred forty-nine".