20913880

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{1087}}^1$

素因数の和:1148

約数の個数: 64

約数和(自身を含む): 52093440

約数和(自身を除く): 31179560

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 37, 40, 52, 65, 74, 104, 130, 148, 185, 260, 296, 370, 481, 520, 740, 962, 1087, 1480, 1924, 2174, 2405, 3848, 4348, 4810, 5435, 8696, 9620, 10870, 14131, 19240, 21740, 28262, 40219, 43480, 56524, 70655, 80438, 113048, 141310, 160876, 201095, 282620, 321752, 402190, 522847, 565240, 804380, 1045694, 1608760, 2091388, 2614235, 4182776, 5228470, 10456940, 20913880]

約数ペア:

[(1, 20913880), (2, 10456940), (4, 5228470), (5, 4182776), (8, 2614235), (10, 2091388), (13, 1608760), (20, 1045694), (26, 804380), (37, 565240), (40, 522847), (52, 402190), (65, 321752), (74, 282620), (104, 201095), (130, 160876), (148, 141310), (185, 113048), (260, 80438), (296, 70655), (370, 56524), (481, 43480), (520, 40219), (740, 28262), (962, 21740), (1087, 19240), (1480, 14131), (1924, 10870), (2174, 9620), (2405, 8696), (3848, 5435), (4348, 4810)]