18728780

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{29}}^1\times {\mathrm{659}}^1$

素因数の和:711

約数の個数: 72

約数和(自身を含む): 47401200

約数和(自身を除く): 28672420

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 29, 35, 49, 58, 70, 98, 116, 140, 145, 196, 203, 245, 290, 406, 490, 580, 659, 812, 980, 1015, 1318, 1421, 2030, 2636, 2842, 3295, 4060, 4613, 5684, 6590, 7105, 9226, 13180, 14210, 18452, 19111, 23065, 28420, 32291, 38222, 46130, 64582, 76444, 92260, 95555, 129164, 133777, 161455, 191110, 267554, 322910, 382220, 535108, 645820, 668885, 936439, 1337770, 1872878, 2675540, 3745756, 4682195, 9364390, 18728780]

約数ペア:

[(1, 18728780), (2, 9364390), (4, 4682195), (5, 3745756), (7, 2675540), (10, 1872878), (14, 1337770), (20, 936439), (28, 668885), (29, 645820), (35, 535108), (49, 382220), (58, 322910), (70, 267554), (98, 191110), (116, 161455), (140, 133777), (145, 129164), (196, 95555), (203, 92260), (245, 76444), (290, 64582), (406, 46130), (490, 38222), (580, 32291), (659, 28420), (812, 23065), (980, 19111), (1015, 18452), (1318, 14210), (1421, 13180), (2030, 9226), (2636, 7105), (2842, 6590), (3295, 5684), (4060, 4613)]