18971240

素因数分解:

$2^3\times 5^1\times {\mathrm{73}}^2\times {\mathrm{89}}^1$

素因数の和:246

約数の個数: 48

約数和(自身を含む): 43764300

約数和(自身を除く): 24793060

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 73, 89, 146, 178, 292, 356, 365, 445, 584, 712, 730, 890, 1460, 1780, 2920, 3560, 5329, 6497, 10658, 12994, 21316, 25988, 26645, 32485, 42632, 51976, 53290, 64970, 106580, 129940, 213160, 259880, 474281, 948562, 1897124, 2371405, 3794248, 4742810, 9485620, 18971240]

約数ペア:

[(1, 18971240), (2, 9485620), (4, 4742810), (5, 3794248), (8, 2371405), (10, 1897124), (20, 948562), (40, 474281), (73, 259880), (89, 213160), (146, 129940), (178, 106580), (292, 64970), (356, 53290), (365, 51976), (445, 42632), (584, 32485), (712, 26645), (730, 25988), (890, 21316), (1460, 12994), (1780, 10658), (2920, 6497), (3560, 5329)]