18939280

素因数分解:

$2^4\times 5^1\times {\mathrm{61}}^1\times {\mathrm{3881}}^1$

素因数の和:3955

約数の個数: 40

約数和(自身を含む): 44767224

約数和(自身を除く): 25827944

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 61, 80, 122, 244, 305, 488, 610, 976, 1220, 2440, 3881, 4880, 7762, 15524, 19405, 31048, 38810, 62096, 77620, 155240, 236741, 310480, 473482, 946964, 1183705, 1893928, 2367410, 3787856, 4734820, 9469640, 18939280]

約数ペア:

[(1, 18939280), (2, 9469640), (4, 4734820), (5, 3787856), (8, 2367410), (10, 1893928), (16, 1183705), (20, 946964), (40, 473482), (61, 310480), (80, 236741), (122, 155240), (244, 77620), (305, 62096), (488, 38810), (610, 31048), (976, 19405), (1220, 15524), (2440, 7762), (3881, 4880)]