20149489 has 2 divisors, whose sum is σ = 20149490. Its totient is φ = 20149488.

The previous prime is 20149477. The next prime is 20149501. The reversal of 20149489 is 98494102.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (20149477) and next prime (20149501).

It can be written as a sum of positive squares in only one way, i.e., 19536400 + 613089 = 4420^2 + 783^2 .

It is a cyclic number.

It is not a de Polignac number, because 20149489 - 2⁵ = 20149457 is a prime.

It is a super-2 number, since 2×20149489² = 812003813922242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20149469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10074744 + 10074745.

It is an arithmetic number, because the mean of its divisors is an integer number (10074745).

Almost surely, 2^20149489 is an apocalyptic number.

It is an amenable number.

20149489 is a deficient number, since it is larger than the sum of its proper divisors (1).

20149489 is an equidigital number, since it uses as much as digits as its factorization.

20149489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 20149489 is about 4488.8182186406. The cubic root of 20149489 is about 272.1163762750.

The spelling of 20149489 in words is "twenty million, one hundred forty-nine thousand, four hundred eighty-nine".