21242440

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{463}}^1$

素因数の和:542

約数の個数: 64

約数和(自身を含む): 50780160

約数和(自身を除く): 29537720

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 37, 40, 62, 74, 124, 148, 155, 185, 248, 296, 310, 370, 463, 620, 740, 926, 1147, 1240, 1480, 1852, 2294, 2315, 3704, 4588, 4630, 5735, 9176, 9260, 11470, 14353, 17131, 18520, 22940, 28706, 34262, 45880, 57412, 68524, 71765, 85655, 114824, 137048, 143530, 171310, 287060, 342620, 531061, 574120, 685240, 1062122, 2124244, 2655305, 4248488, 5310610, 10621220, 21242440]

約数ペア:

[(1, 21242440), (2, 10621220), (4, 5310610), (5, 4248488), (8, 2655305), (10, 2124244), (20, 1062122), (31, 685240), (37, 574120), (40, 531061), (62, 342620), (74, 287060), (124, 171310), (148, 143530), (155, 137048), (185, 114824), (248, 85655), (296, 71765), (310, 68524), (370, 57412), (463, 45880), (620, 34262), (740, 28706), (926, 22940), (1147, 18520), (1240, 17131), (1480, 14353), (1852, 11470), (2294, 9260), (2315, 9176), (3704, 5735), (4588, 4630)]