18697720

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{79}}^1\times {\mathrm{97}}^1$

素因数の和:248

約数の個数: 64

約数和(自身を含む): 43747200

約数和(自身を除く): 25049480

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 79, 97, 122, 158, 194, 244, 305, 316, 388, 395, 485, 488, 610, 632, 776, 790, 970, 1220, 1580, 1940, 2440, 3160, 3880, 4819, 5917, 7663, 9638, 11834, 15326, 19276, 23668, 24095, 29585, 30652, 38315, 38552, 47336, 48190, 59170, 61304, 76630, 96380, 118340, 153260, 192760, 236680, 306520, 467443, 934886, 1869772, 2337215, 3739544, 4674430, 9348860, 18697720]

約数ペア:

[(1, 18697720), (2, 9348860), (4, 4674430), (5, 3739544), (8, 2337215), (10, 1869772), (20, 934886), (40, 467443), (61, 306520), (79, 236680), (97, 192760), (122, 153260), (158, 118340), (194, 96380), (244, 76630), (305, 61304), (316, 59170), (388, 48190), (395, 47336), (485, 38552), (488, 38315), (610, 30652), (632, 29585), (776, 24095), (790, 23668), (970, 19276), (1220, 15326), (1580, 11834), (1940, 9638), (2440, 7663), (3160, 5917), (3880, 4819)]