20965749 has 16 divisors (see below), whose sum is σ = 32039040. Its totient is φ = 11946240.

The previous prime is 20965741. The next prime is 20965757. The reversal of 20965749 is 94756902.

It is an interprime number because it is at equal distance from previous prime (20965741) and next prime (20965757).

It is not a de Polignac number, because 20965749 - 2³ = 20965741 is a prime.

It is a super-2 number, since 2×20965749² = 879125262262002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20965749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20965741) 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 in 15 ways as a sum of consecutive naturals, for example, 7369 + ... + 9809.

It is an arithmetic number, because the mean of its divisors is an integer number (2002440).

Almost surely, 2^20965749 is an apocalyptic number.

It is an amenable number.

20965749 is a deficient number, since it is larger than the sum of its proper divisors (11073291).

20965749 is a wasteful number, since it uses less digits than its factorization.

20965749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 20965749 is about 4578.8370794340. The cubic root of 20965749 is about 275.7423425066.

The spelling of 20965749 in words is "twenty million, nine hundred sixty-five thousand, seven hundred forty-nine".