20156741 has 8 divisors (see below), whose sum is σ = 22053504. Its totient is φ = 18270720.

The previous prime is 20156737. The next prime is 20156753. The reversal of 20156741 is 14765102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20156741 - 2² = 20156737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20156741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20116741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1541 + ... + 6533.

It is an arithmetic number, because the mean of its divisors is an integer number (2756688).

Almost surely, 2^20156741 is an apocalyptic number.

It is an amenable number.

20156741 is a deficient number, since it is larger than the sum of its proper divisors (1896763).

20156741 is a wasteful number, since it uses less digits than its factorization.

20156741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5371.

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

The square root of 20156741 is about 4489.6259309657. The cubic root of 20156741 is about 272.1490181492.

The spelling of 20156741 in words is "twenty million, one hundred fifty-six thousand, seven hundred forty-one".