19998582980

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^2\times {\mathrm{79}}^1\times {\mathrm{13171}}^1$

素因数の和:13321

約数の個数: 72

約数和(自身を含む): 43948114560

約数和(自身を除く): 23949531580

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 79, 124, 155, 158, 310, 316, 395, 620, 790, 961, 1580, 1922, 2449, 3844, 4805, 4898, 9610, 9796, 12245, 13171, 19220, 24490, 26342, 48980, 52684, 65855, 75919, 131710, 151838, 263420, 303676, 379595, 408301, 759190, 816602, 1040509, 1518380, 1633204, 2041505, 2081018, 4083010, 4162036, 5202545, 8166020, 10405090, 12657331, 20810180, 25314662, 32255779, 50629324, 63286655, 64511558, 126573310, 129023116, 161278895, 253146620, 322557790, 645115580, 999929149, 1999858298, 3999716596, 4999645745, 9999291490, 19998582980]

約数ペア:

[(1, 19998582980), (2, 9999291490), (4, 4999645745), (5, 3999716596), (10, 1999858298), (20, 999929149), (31, 645115580), (62, 322557790), (79, 253146620), (124, 161278895), (155, 129023116), (158, 126573310), (310, 64511558), (316, 63286655), (395, 50629324), (620, 32255779), (790, 25314662), (961, 20810180), (1580, 12657331), (1922, 10405090), (2449, 8166020), (3844, 5202545), (4805, 4162036), (4898, 4083010), (9610, 2081018), (9796, 2041505), (12245, 1633204), (13171, 1518380), (19220, 1040509), (24490, 816602), (26342, 759190), (48980, 408301), (52684, 379595), (65855, 303676), (75919, 263420), (131710, 151838)]