20998640

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{331}}^1$

素因数の和:418

約数の個数: 80

約数和(自身を含む): 53600736

約数和(自身を除く): 32602096

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 61, 65, 80, 104, 122, 130, 208, 244, 260, 305, 331, 488, 520, 610, 662, 793, 976, 1040, 1220, 1324, 1586, 1655, 2440, 2648, 3172, 3310, 3965, 4303, 4880, 5296, 6344, 6620, 7930, 8606, 12688, 13240, 15860, 17212, 20191, 21515, 26480, 31720, 34424, 40382, 43030, 63440, 68848, 80764, 86060, 100955, 161528, 172120, 201910, 262483, 323056, 344240, 403820, 524966, 807640, 1049932, 1312415, 1615280, 2099864, 2624830, 4199728, 5249660, 10499320, 20998640]

約数ペア:

[(1, 20998640), (2, 10499320), (4, 5249660), (5, 4199728), (8, 2624830), (10, 2099864), (13, 1615280), (16, 1312415), (20, 1049932), (26, 807640), (40, 524966), (52, 403820), (61, 344240), (65, 323056), (80, 262483), (104, 201910), (122, 172120), (130, 161528), (208, 100955), (244, 86060), (260, 80764), (305, 68848), (331, 63440), (488, 43030), (520, 40382), (610, 34424), (662, 31720), (793, 26480), (976, 21515), (1040, 20191), (1220, 17212), (1324, 15860), (1586, 13240), (1655, 12688), (2440, 8606), (2648, 7930), (3172, 6620), (3310, 6344), (3965, 5296), (4303, 4880)]