21990904

素因数分解:

$2^3\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{359}}^1$

素因数の和:428

約数の個数: 64

約数和(自身を含む): 48384000

約数和(自身を除く): 26393096

約数列:

[1, 2, 4, 8, 13, 19, 26, 31, 38, 52, 62, 76, 104, 124, 152, 247, 248, 359, 403, 494, 589, 718, 806, 988, 1178, 1436, 1612, 1976, 2356, 2872, 3224, 4667, 4712, 6821, 7657, 9334, 11129, 13642, 15314, 18668, 22258, 27284, 30628, 37336, 44516, 54568, 61256, 88673, 89032, 144677, 177346, 211451, 289354, 354692, 422902, 578708, 709384, 845804, 1157416, 1691608, 2748863, 5497726, 10995452, 21990904]

約数ペア:

[(1, 21990904), (2, 10995452), (4, 5497726), (8, 2748863), (13, 1691608), (19, 1157416), (26, 845804), (31, 709384), (38, 578708), (52, 422902), (62, 354692), (76, 289354), (104, 211451), (124, 177346), (152, 144677), (247, 89032), (248, 88673), (359, 61256), (403, 54568), (494, 44516), (589, 37336), (718, 30628), (806, 27284), (988, 22258), (1178, 18668), (1436, 15314), (1612, 13642), (1976, 11129), (2356, 9334), (2872, 7657), (3224, 6821), (4667, 4712)]