20953775 has 24 divisors (see below), whose sum is σ = 28123200. Its totient is φ = 15426560.

The previous prime is 20953717. The next prime is 20953811. The reversal of 20953775 is 57735902.

It is not a de Polignac number, because 20953775 - 2¹⁰ = 20952751 is a prime.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19451 + ... + 20499.

It is an arithmetic number, because the mean of its divisors is an integer number (1171800).

Almost surely, 2^20953775 is an apocalyptic number.

20953775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20953775 is a deficient number, since it is larger than the sum of its proper divisors (7169425).

20953775 is a wasteful number, since it uses less digits than its factorization.

20953775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123 (or 1118 counting only the distinct ones).

The product of its (nonzero) digits is 66150, while the sum is 38.

The square root of 20953775 is about 4577.5293554493. The cubic root of 20953775 is about 275.6898383394.

The spelling of 20953775 in words is "twenty million, nine hundred fifty-three thousand, seven hundred seventy-five".