20970511 has 2 divisors, whose sum is σ = 20970512. Its totient is φ = 20970510.

The previous prime is 20970473. The next prime is 20970517. The reversal of 20970511 is 11507902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20970511 - 2²³ = 12581903 is a prime.

It is a super-2 number, since 2×20970511² = 879524663202242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20970517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10485255 + 10485256.

It is an arithmetic number, because the mean of its divisors is an integer number (10485256).

Almost surely, 2^20970511 is an apocalyptic number.

20970511 is a deficient number, since it is larger than the sum of its proper divisors (1).

20970511 is an equidigital number, since it uses as much as digits as its factorization.

20970511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 20970511 is about 4579.3570509407. The cubic root of 20970511 is about 275.7632175957.

The spelling of 20970511 in words is "twenty million, nine hundred seventy thousand, five hundred eleven".