19973980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{4519}}^1$

素因数の和:4558

約数の個数: 48

約数和(自身を含む): 47839680

約数和(自身を除く): 27865700

約数列:

[1, 2, 4, 5, 10, 13, 17, 20, 26, 34, 52, 65, 68, 85, 130, 170, 221, 260, 340, 442, 884, 1105, 2210, 4420, 4519, 9038, 18076, 22595, 45190, 58747, 76823, 90380, 117494, 153646, 234988, 293735, 307292, 384115, 587470, 768230, 998699, 1174940, 1536460, 1997398, 3994796, 4993495, 9986990, 19973980]

約数ペア:

[(1, 19973980), (2, 9986990), (4, 4993495), (5, 3994796), (10, 1997398), (13, 1536460), (17, 1174940), (20, 998699), (26, 768230), (34, 587470), (52, 384115), (65, 307292), (68, 293735), (85, 234988), (130, 153646), (170, 117494), (221, 90380), (260, 76823), (340, 58747), (442, 45190), (884, 22595), (1105, 18076), (2210, 9038), (4420, 4519)]