19985735

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1$

素因数の和:144

約数の個数: 64

約数和(自身を含む): 32569344

約数和(自身を除く): 12583609

約数列:

[1, 5, 7, 11, 23, 35, 37, 55, 61, 77, 115, 161, 185, 253, 259, 305, 385, 407, 427, 671, 805, 851, 1265, 1295, 1403, 1771, 2035, 2135, 2257, 2849, 3355, 4255, 4697, 5957, 7015, 8855, 9361, 9821, 11285, 14245, 15433, 15799, 23485, 24827, 29785, 46805, 49105, 51911, 65527, 77165, 78995, 108031, 124135, 173789, 259555, 327635, 363377, 540155, 571021, 868945, 1816885, 2855105, 3997147, 19985735]

約数ペア:

[(1, 19985735), (5, 3997147), (7, 2855105), (11, 1816885), (23, 868945), (35, 571021), (37, 540155), (55, 363377), (61, 327635), (77, 259555), (115, 173789), (161, 124135), (185, 108031), (253, 78995), (259, 77165), (305, 65527), (385, 51911), (407, 49105), (427, 46805), (671, 29785), (805, 24827), (851, 23485), (1265, 15799), (1295, 15433), (1403, 14245), (1771, 11285), (2035, 9821), (2135, 9361), (2257, 8855), (2849, 7015), (3355, 5957), (4255, 4697)]