20640080

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{367}}^1$

素因数の和:436

約数の個数: 80

約数和(自身を含む): 52020480

約数和(自身を除く): 31380400

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 37, 38, 40, 74, 76, 80, 95, 148, 152, 185, 190, 296, 304, 367, 370, 380, 592, 703, 734, 740, 760, 1406, 1468, 1480, 1520, 1835, 2812, 2936, 2960, 3515, 3670, 5624, 5872, 6973, 7030, 7340, 11248, 13579, 13946, 14060, 14680, 27158, 27892, 28120, 29360, 34865, 54316, 55784, 56240, 67895, 69730, 108632, 111568, 135790, 139460, 217264, 258001, 271580, 278920, 516002, 543160, 557840, 1032004, 1086320, 1290005, 2064008, 2580010, 4128016, 5160020, 10320040, 20640080]

約数ペア:

[(1, 20640080), (2, 10320040), (4, 5160020), (5, 4128016), (8, 2580010), (10, 2064008), (16, 1290005), (19, 1086320), (20, 1032004), (37, 557840), (38, 543160), (40, 516002), (74, 278920), (76, 271580), (80, 258001), (95, 217264), (148, 139460), (152, 135790), (185, 111568), (190, 108632), (296, 69730), (304, 67895), (367, 56240), (370, 55784), (380, 54316), (592, 34865), (703, 29360), (734, 28120), (740, 27892), (760, 27158), (1406, 14680), (1468, 14060), (1480, 13946), (1520, 13579), (1835, 11248), (2812, 7340), (2936, 7030), (2960, 6973), (3515, 5872), (3670, 5624)]