20741651 has 6 divisors (see below), whose sum is σ = 24128100. Its totient is φ = 17778516.

The previous prime is 20741621. The next prime is 20741713. The reversal of 20741651 is 15614702.

It is not a de Polignac number, because 20741651 - 2¹⁸ = 20479507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20741651.

It is not an unprimeable number, because it can be changed into a prime (20741621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211601 + ... + 211698.

It is an arithmetic number, because the mean of its divisors is an integer number (4021350).

Almost surely, 2^20741651 is an apocalyptic number.

20741651 is a deficient number, since it is larger than the sum of its proper divisors (3386449).

20741651 is an equidigital number, since it uses as much as digits as its factorization.

20741651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423313 (or 423306 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20741651 is about 4554.3002755637. The cubic root of 20741651 is about 274.7563726597.

The spelling of 20741651 in words is "twenty million, seven hundred forty-one thousand, six hundred fifty-one".