81281720

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{2333}}^1$

素因数の和:2424

約数の個数: 64

約数和(自身を含む): 199977120

約数和(自身を除く): 118695400

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 67, 104, 130, 134, 260, 268, 335, 520, 536, 670, 871, 1340, 1742, 2333, 2680, 3484, 4355, 4666, 6968, 8710, 9332, 11665, 17420, 18664, 23330, 30329, 34840, 46660, 60658, 93320, 121316, 151645, 156311, 242632, 303290, 312622, 606580, 625244, 781555, 1213160, 1250488, 1563110, 2032043, 3126220, 4064086, 6252440, 8128172, 10160215, 16256344, 20320430, 40640860, 81281720]

約数ペア:

[(1, 81281720), (2, 40640860), (4, 20320430), (5, 16256344), (8, 10160215), (10, 8128172), (13, 6252440), (20, 4064086), (26, 3126220), (40, 2032043), (52, 1563110), (65, 1250488), (67, 1213160), (104, 781555), (130, 625244), (134, 606580), (260, 312622), (268, 303290), (335, 242632), (520, 156311), (536, 151645), (670, 121316), (871, 93320), (1340, 60658), (1742, 46660), (2333, 34840), (2680, 30329), (3484, 23330), (4355, 18664), (4666, 17420), (6968, 11665), (8710, 9332)]