81509420

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1\times {\mathrm{941}}^1$

素因数の和:1082

約数の個数: 48

約数和(自身を含む): 176613696

約数和(自身を除く): 95104276

約数列:

[1, 2, 4, 5, 10, 20, 61, 71, 122, 142, 244, 284, 305, 355, 610, 710, 941, 1220, 1420, 1882, 3764, 4331, 4705, 8662, 9410, 17324, 18820, 21655, 43310, 57401, 66811, 86620, 114802, 133622, 229604, 267244, 287005, 334055, 574010, 668110, 1148020, 1336220, 4075471, 8150942, 16301884, 20377355, 40754710, 81509420]

約数ペア:

[(1, 81509420), (2, 40754710), (4, 20377355), (5, 16301884), (10, 8150942), (20, 4075471), (61, 1336220), (71, 1148020), (122, 668110), (142, 574010), (244, 334055), (284, 287005), (305, 267244), (355, 229604), (610, 133622), (710, 114802), (941, 86620), (1220, 66811), (1420, 57401), (1882, 43310), (3764, 21655), (4331, 18820), (4705, 17324), (8662, 9410)]