21208340

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{433}}^1$

素因数の和:552

約数の個数: 48

約数和(自身を含む): 46663680

約数和(自身を除く): 25455340

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 79, 124, 155, 158, 310, 316, 395, 433, 620, 790, 866, 1580, 1732, 2165, 2449, 4330, 4898, 8660, 9796, 12245, 13423, 24490, 26846, 34207, 48980, 53692, 67115, 68414, 134230, 136828, 171035, 268460, 342070, 684140, 1060417, 2120834, 4241668, 5302085, 10604170, 21208340]

約数ペア:

[(1, 21208340), (2, 10604170), (4, 5302085), (5, 4241668), (10, 2120834), (20, 1060417), (31, 684140), (62, 342070), (79, 268460), (124, 171035), (155, 136828), (158, 134230), (310, 68414), (316, 67115), (395, 53692), (433, 48980), (620, 34207), (790, 26846), (866, 24490), (1580, 13423), (1732, 12245), (2165, 9796), (2449, 8660), (4330, 4898)]