19919980

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^2\times {\mathrm{31}}^1\times {\mathrm{89}}^1$

素因数の和:167

約数の個数: 72

約数和(自身を含む): 46085760

約数和(自身を除く): 26165780

約数列:

[1, 2, 4, 5, 10, 19, 20, 31, 38, 62, 76, 89, 95, 124, 155, 178, 190, 310, 356, 361, 380, 445, 589, 620, 722, 890, 1178, 1444, 1691, 1780, 1805, 2356, 2759, 2945, 3382, 3610, 5518, 5890, 6764, 7220, 8455, 11036, 11191, 11780, 13795, 16910, 22382, 27590, 32129, 33820, 44764, 52421, 55180, 55955, 64258, 104842, 111910, 128516, 160645, 209684, 223820, 262105, 321290, 524210, 642580, 995999, 1048420, 1991998, 3983996, 4979995, 9959990, 19919980]

約数ペア:

[(1, 19919980), (2, 9959990), (4, 4979995), (5, 3983996), (10, 1991998), (19, 1048420), (20, 995999), (31, 642580), (38, 524210), (62, 321290), (76, 262105), (89, 223820), (95, 209684), (124, 160645), (155, 128516), (178, 111910), (190, 104842), (310, 64258), (356, 55955), (361, 55180), (380, 52421), (445, 44764), (589, 33820), (620, 32129), (722, 27590), (890, 22382), (1178, 16910), (1444, 13795), (1691, 11780), (1780, 11191), (1805, 11036), (2356, 8455), (2759, 7220), (2945, 6764), (3382, 5890), (3610, 5518)]