640039920

素因数分解:

$2^4\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{205141}}^1$

素因数の和:205170

約数の個数: 80

約数和(自身を含む): 2136759072

約数和(自身を除く): 1496719152

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 16, 20, 24, 26, 30, 39, 40, 48, 52, 60, 65, 78, 80, 104, 120, 130, 156, 195, 208, 240, 260, 312, 390, 520, 624, 780, 1040, 1560, 3120, 205141, 410282, 615423, 820564, 1025705, 1230846, 1641128, 2051410, 2461692, 2666833, 3077115, 3282256, 4102820, 4923384, 5333666, 6154230, 8000499, 8205640, 9846768, 10667332, 12308460, 13334165, 16000998, 16411280, 21334664, 24616920, 26668330, 32001996, 40002495, 42669328, 49233840, 53336660, 64003992, 80004990, 106673320, 128007984, 160009980, 213346640, 320019960, 640039920]

約数ペア:

[(1, 640039920), (2, 320019960), (3, 213346640), (4, 160009980), (5, 128007984), (6, 106673320), (8, 80004990), (10, 64003992), (12, 53336660), (13, 49233840), (15, 42669328), (16, 40002495), (20, 32001996), (24, 26668330), (26, 24616920), (30, 21334664), (39, 16411280), (40, 16000998), (48, 13334165), (52, 12308460), (60, 10667332), (65, 9846768), (78, 8205640), (80, 8000499), (104, 6154230), (120, 5333666), (130, 4923384), (156, 4102820), (195, 3282256), (208, 3077115), (240, 2666833), (260, 2461692), (312, 2051410), (390, 1641128), (520, 1230846), (624, 1025705), (780, 820564), (1040, 615423), (1560, 410282), (3120, 205141)]