20890480

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{379}}^1$

素因数の和:458

約数の個数: 80

約数和(自身を含む): 53434080

約数和(自身を除く): 32543600

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 53, 65, 80, 104, 106, 130, 208, 212, 260, 265, 379, 424, 520, 530, 689, 758, 848, 1040, 1060, 1378, 1516, 1895, 2120, 2756, 3032, 3445, 3790, 4240, 4927, 5512, 6064, 6890, 7580, 9854, 11024, 13780, 15160, 19708, 20087, 24635, 27560, 30320, 39416, 40174, 49270, 55120, 78832, 80348, 98540, 100435, 160696, 197080, 200870, 261131, 321392, 394160, 401740, 522262, 803480, 1044524, 1305655, 1606960, 2089048, 2611310, 4178096, 5222620, 10445240, 20890480]

約数ペア:

[(1, 20890480), (2, 10445240), (4, 5222620), (5, 4178096), (8, 2611310), (10, 2089048), (13, 1606960), (16, 1305655), (20, 1044524), (26, 803480), (40, 522262), (52, 401740), (53, 394160), (65, 321392), (80, 261131), (104, 200870), (106, 197080), (130, 160696), (208, 100435), (212, 98540), (260, 80348), (265, 78832), (379, 55120), (424, 49270), (520, 40174), (530, 39416), (689, 30320), (758, 27560), (848, 24635), (1040, 20087), (1060, 19708), (1378, 15160), (1516, 13780), (1895, 11024), (2120, 9854), (2756, 7580), (3032, 6890), (3445, 6064), (3790, 5512), (4240, 4927)]