20958749 has 16 divisors (see below), whose sum is σ = 24810240. Its totient is φ = 17331840.

The previous prime is 20958737. The next prime is 20958781. The reversal of 20958749 is 94785902.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20958749 - 2¹² = 20954653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20958719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29207 + ... + 29915.

It is an arithmetic number, because the mean of its divisors is an integer number (1550640).

Almost surely, 2^20958749 is an apocalyptic number.

It is an amenable number.

20958749 is a deficient number, since it is larger than the sum of its proper divisors (3851491).

20958749 is a wasteful number, since it uses less digits than its factorization.

20958749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 20958749 is about 4578.0726293933. The cubic root of 20958749 is about 275.7116510003.

The spelling of 20958749 in words is "twenty million, nine hundred fifty-eight thousand, seven hundred forty-nine".