21698456

素因数分解:

$2^3\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{79}}^1\times {\mathrm{139}}^1$

素因数の和:256

約数の個数: 64

約数和(自身を含む): 47040000

約数和(自身を除く): 25341544

約数列:

[1, 2, 4, 8, 13, 19, 26, 38, 52, 76, 79, 104, 139, 152, 158, 247, 278, 316, 494, 556, 632, 988, 1027, 1112, 1501, 1807, 1976, 2054, 2641, 3002, 3614, 4108, 5282, 6004, 7228, 8216, 10564, 10981, 12008, 14456, 19513, 21128, 21962, 34333, 39026, 43924, 68666, 78052, 87848, 137332, 142753, 156104, 208639, 274664, 285506, 417278, 571012, 834556, 1142024, 1669112, 2712307, 5424614, 10849228, 21698456]

約数ペア:

[(1, 21698456), (2, 10849228), (4, 5424614), (8, 2712307), (13, 1669112), (19, 1142024), (26, 834556), (38, 571012), (52, 417278), (76, 285506), (79, 274664), (104, 208639), (139, 156104), (152, 142753), (158, 137332), (247, 87848), (278, 78052), (316, 68666), (494, 43924), (556, 39026), (632, 34333), (988, 21962), (1027, 21128), (1112, 19513), (1501, 14456), (1807, 12008), (1976, 10981), (2054, 10564), (2641, 8216), (3002, 7228), (3614, 6004), (4108, 5282)]