21086480

素因数分解:

$2^4\times 5^1\times {\mathrm{29}}^1\times {\mathrm{61}}^1\times {\mathrm{149}}^1$

素因数の和:252

約数の個数: 80

約数和(自身を含む): 51894000

約数和(自身を除く): 30807520

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 29, 40, 58, 61, 80, 116, 122, 145, 149, 232, 244, 290, 298, 305, 464, 488, 580, 596, 610, 745, 976, 1160, 1192, 1220, 1490, 1769, 2320, 2384, 2440, 2980, 3538, 4321, 4880, 5960, 7076, 8642, 8845, 9089, 11920, 14152, 17284, 17690, 18178, 21605, 28304, 34568, 35380, 36356, 43210, 45445, 69136, 70760, 72712, 86420, 90890, 141520, 145424, 172840, 181780, 263581, 345680, 363560, 527162, 727120, 1054324, 1317905, 2108648, 2635810, 4217296, 5271620, 10543240, 21086480]

約数ペア:

[(1, 21086480), (2, 10543240), (4, 5271620), (5, 4217296), (8, 2635810), (10, 2108648), (16, 1317905), (20, 1054324), (29, 727120), (40, 527162), (58, 363560), (61, 345680), (80, 263581), (116, 181780), (122, 172840), (145, 145424), (149, 141520), (232, 90890), (244, 86420), (290, 72712), (298, 70760), (305, 69136), (464, 45445), (488, 43210), (580, 36356), (596, 35380), (610, 34568), (745, 28304), (976, 21605), (1160, 18178), (1192, 17690), (1220, 17284), (1490, 14152), (1769, 11920), (2320, 9089), (2384, 8845), (2440, 8642), (2980, 7076), (3538, 5960), (4321, 4880)]