21818420

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{2707}}^1$

素因数の和:2760

約数の個数: 48

約数和(自身を含む): 50953728

約数和(自身を除く): 29135308

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 31, 52, 62, 65, 124, 130, 155, 260, 310, 403, 620, 806, 1612, 2015, 2707, 4030, 5414, 8060, 10828, 13535, 27070, 35191, 54140, 70382, 83917, 140764, 167834, 175955, 335668, 351910, 419585, 703820, 839170, 1090921, 1678340, 2181842, 4363684, 5454605, 10909210, 21818420]

約数ペア:

[(1, 21818420), (2, 10909210), (4, 5454605), (5, 4363684), (10, 2181842), (13, 1678340), (20, 1090921), (26, 839170), (31, 703820), (52, 419585), (62, 351910), (65, 335668), (124, 175955), (130, 167834), (155, 140764), (260, 83917), (310, 70382), (403, 54140), (620, 35191), (806, 27070), (1612, 13535), (2015, 10828), (2707, 8060), (4030, 5414)]