21587960

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{599}}^1$

素因数の和:680

約数の個数: 64

約数和(自身を含む): 52488000

約数和(自身を除く): 30900040

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 53, 68, 85, 106, 136, 170, 212, 265, 340, 424, 530, 599, 680, 901, 1060, 1198, 1802, 2120, 2396, 2995, 3604, 4505, 4792, 5990, 7208, 9010, 10183, 11980, 18020, 20366, 23960, 31747, 36040, 40732, 50915, 63494, 81464, 101830, 126988, 158735, 203660, 253976, 317470, 407320, 539699, 634940, 1079398, 1269880, 2158796, 2698495, 4317592, 5396990, 10793980, 21587960]

約数ペア:

[(1, 21587960), (2, 10793980), (4, 5396990), (5, 4317592), (8, 2698495), (10, 2158796), (17, 1269880), (20, 1079398), (34, 634940), (40, 539699), (53, 407320), (68, 317470), (85, 253976), (106, 203660), (136, 158735), (170, 126988), (212, 101830), (265, 81464), (340, 63494), (424, 50915), (530, 40732), (599, 36040), (680, 31747), (901, 23960), (1060, 20366), (1198, 18020), (1802, 11980), (2120, 10183), (2396, 9010), (2995, 7208), (3604, 5990), (4505, 4792)]