19896940

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{79}}^1\times {\mathrm{257}}^1$

素因数の和:359

約数の個数: 72

約数和(自身を含む): 49412160

約数和(自身を除く): 29515220

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 79, 98, 140, 158, 196, 245, 257, 316, 395, 490, 514, 553, 790, 980, 1028, 1106, 1285, 1580, 1799, 2212, 2570, 2765, 3598, 3871, 5140, 5530, 7196, 7742, 8995, 11060, 12593, 15484, 17990, 19355, 20303, 25186, 35980, 38710, 40606, 50372, 62965, 77420, 81212, 101515, 125930, 142121, 203030, 251860, 284242, 406060, 568484, 710605, 994847, 1421210, 1989694, 2842420, 3979388, 4974235, 9948470, 19896940]

約数ペア:

[(1, 19896940), (2, 9948470), (4, 4974235), (5, 3979388), (7, 2842420), (10, 1989694), (14, 1421210), (20, 994847), (28, 710605), (35, 568484), (49, 406060), (70, 284242), (79, 251860), (98, 203030), (140, 142121), (158, 125930), (196, 101515), (245, 81212), (257, 77420), (316, 62965), (395, 50372), (490, 40606), (514, 38710), (553, 35980), (790, 25186), (980, 20303), (1028, 19355), (1106, 17990), (1285, 15484), (1580, 12593), (1799, 11060), (2212, 8995), (2570, 7742), (2765, 7196), (3598, 5530), (3871, 5140)]