21678825

素因数分解:

$3^1\times 5^2\times 7^2\times {\mathrm{17}}^1\times {\mathrm{347}}^1$

素因数の和:391

約数の個数: 72

約数和(自身を含む): 44273952

約数和(自身を除く): 22595127

約数列:

[1, 3, 5, 7, 15, 17, 21, 25, 35, 49, 51, 75, 85, 105, 119, 147, 175, 245, 255, 347, 357, 425, 525, 595, 735, 833, 1041, 1225, 1275, 1735, 1785, 2429, 2499, 2975, 3675, 4165, 5205, 5899, 7287, 8675, 8925, 12145, 12495, 17003, 17697, 20825, 26025, 29495, 36435, 41293, 51009, 60725, 62475, 85015, 88485, 123879, 147475, 182175, 206465, 255045, 289051, 425075, 442425, 619395, 867153, 1032325, 1275225, 1445255, 3096975, 4335765, 7226275, 21678825]

約数ペア:

[(1, 21678825), (3, 7226275), (5, 4335765), (7, 3096975), (15, 1445255), (17, 1275225), (21, 1032325), (25, 867153), (35, 619395), (49, 442425), (51, 425075), (75, 289051), (85, 255045), (105, 206465), (119, 182175), (147, 147475), (175, 123879), (245, 88485), (255, 85015), (347, 62475), (357, 60725), (425, 51009), (525, 41293), (595, 36435), (735, 29495), (833, 26025), (1041, 20825), (1225, 17697), (1275, 17003), (1735, 12495), (1785, 12145), (2429, 8925), (2499, 8675), (2975, 7287), (3675, 5899), (4165, 5205)]