81863780

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{211}}^1\times {\mathrm{1021}}^1$

素因数の和:1260

約数の個数: 48

約数和(自身を含む): 181997760

約数和(自身を除く): 100133980

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 190, 211, 380, 422, 844, 1021, 1055, 2042, 2110, 4009, 4084, 4220, 5105, 8018, 10210, 16036, 19399, 20045, 20420, 38798, 40090, 77596, 80180, 96995, 193990, 215431, 387980, 430862, 861724, 1077155, 2154310, 4093189, 4308620, 8186378, 16372756, 20465945, 40931890, 81863780]

約数ペア:

[(1, 81863780), (2, 40931890), (4, 20465945), (5, 16372756), (10, 8186378), (19, 4308620), (20, 4093189), (38, 2154310), (76, 1077155), (95, 861724), (190, 430862), (211, 387980), (380, 215431), (422, 193990), (844, 96995), (1021, 80180), (1055, 77596), (2042, 40090), (2110, 38798), (4009, 20420), (4084, 20045), (4220, 19399), (5105, 16036), (8018, 10210)]