20555210

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{131}}^1$

素因数の和:239

約数の個数: 64

約数和(自身を含む): 43110144

約数和(自身を除く): 22554934

約数列:

[1, 2, 5, 10, 13, 17, 26, 34, 65, 71, 85, 130, 131, 142, 170, 221, 262, 355, 442, 655, 710, 923, 1105, 1207, 1310, 1703, 1846, 2210, 2227, 2414, 3406, 4454, 4615, 6035, 8515, 9230, 9301, 11135, 12070, 15691, 17030, 18602, 22270, 28951, 31382, 46505, 57902, 78455, 93010, 120913, 144755, 156910, 158117, 241826, 289510, 316234, 604565, 790585, 1209130, 1581170, 2055521, 4111042, 10277605, 20555210]

約数ペア:

[(1, 20555210), (2, 10277605), (5, 4111042), (10, 2055521), (13, 1581170), (17, 1209130), (26, 790585), (34, 604565), (65, 316234), (71, 289510), (85, 241826), (130, 158117), (131, 156910), (142, 144755), (170, 120913), (221, 93010), (262, 78455), (355, 57902), (442, 46505), (655, 31382), (710, 28951), (923, 22270), (1105, 18602), (1207, 17030), (1310, 15691), (1703, 12070), (1846, 11135), (2210, 9301), (2227, 9230), (2414, 8515), (3406, 6035), (4454, 4615)]