21000916520

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{277643}}^1$

素因数の和:277746

約数の個数: 64

約数和(自身を含む): 49576112640

約数和(自身を除く): 28575196120

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 61, 62, 122, 124, 155, 244, 248, 305, 310, 488, 610, 620, 1220, 1240, 1891, 2440, 3782, 7564, 9455, 15128, 18910, 37820, 75640, 277643, 555286, 1110572, 1388215, 2221144, 2776430, 5552860, 8606933, 11105720, 16936223, 17213866, 33872446, 34427732, 43034665, 67744892, 68855464, 84681115, 86069330, 135489784, 169362230, 172138660, 338724460, 344277320, 525022913, 677448920, 1050045826, 2100091652, 2625114565, 4200183304, 5250229130, 10500458260, 21000916520]

約数ペア:

[(1, 21000916520), (2, 10500458260), (4, 5250229130), (5, 4200183304), (8, 2625114565), (10, 2100091652), (20, 1050045826), (31, 677448920), (40, 525022913), (61, 344277320), (62, 338724460), (122, 172138660), (124, 169362230), (155, 135489784), (244, 86069330), (248, 84681115), (305, 68855464), (310, 67744892), (488, 43034665), (610, 34427732), (620, 33872446), (1220, 17213866), (1240, 16936223), (1891, 11105720), (2440, 8606933), (3782, 5552860), (7564, 2776430), (9455, 2221144), (15128, 1388215), (18910, 1110572), (37820, 555286), (75640, 277643)]