21255440

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{15629}}^1$

素因数の和:15659

約数の個数: 40

約数和(自身を含む): 52329240

約数和(自身を除く): 31073800

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 680, 1360, 15629, 31258, 62516, 78145, 125032, 156290, 250064, 265693, 312580, 531386, 625160, 1062772, 1250320, 1328465, 2125544, 2656930, 4251088, 5313860, 10627720, 21255440]

約数ペア:

[(1, 21255440), (2, 10627720), (4, 5313860), (5, 4251088), (8, 2656930), (10, 2125544), (16, 1328465), (17, 1250320), (20, 1062772), (34, 625160), (40, 531386), (68, 312580), (80, 265693), (85, 250064), (136, 156290), (170, 125032), (272, 78145), (340, 62516), (680, 31258), (1360, 15629)]