20389741 has 2 divisors, whose sum is σ = 20389742. Its totient is φ = 20389740.

The previous prime is 20389729. The next prime is 20389763. The reversal of 20389741 is 14798302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18275625 + 2114116 = 4275^2 + 1454^2 .

It is a cyclic number.

It is not a de Polignac number, because 20389741 - 2¹¹ = 20387693 is a prime.

It is the 4516-th Hogben number.

It is equal to p_1293766 and since 20389741 and 1293766 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 20389697 and 20389706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20389541) by changing a digit.

It is a nontrivial repunit in base 4515.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10194870 + 10194871.

It is an arithmetic number, because the mean of its divisors is an integer number (10194871).

Almost surely, 2^20389741 is an apocalyptic number.

It is an amenable number.

20389741 is a deficient number, since it is larger than the sum of its proper divisors (1).

20389741 is an equidigital number, since it uses as much as digits as its factorization.

20389741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20389741 is about 4515.5000830473. The cubic root of 20389741 is about 273.1936306052.

The spelling of 20389741 in words is "twenty million, three hundred eighty-nine thousand, seven hundred forty-one".