81128720

素因数分解:

$2^4\times 5^1\times {\mathrm{653}}^1\times {\mathrm{1553}}^1$

素因数の和:2219

約数の個数: 40

約数和(自身を含む): 189034776

約数和(自身を除く): 107906056

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 653, 1306, 1553, 2612, 3106, 3265, 5224, 6212, 6530, 7765, 10448, 12424, 13060, 15530, 24848, 26120, 31060, 52240, 62120, 124240, 1014109, 2028218, 4056436, 5070545, 8112872, 10141090, 16225744, 20282180, 40564360, 81128720]

約数ペア:

[(1, 81128720), (2, 40564360), (4, 20282180), (5, 16225744), (8, 10141090), (10, 8112872), (16, 5070545), (20, 4056436), (40, 2028218), (80, 1014109), (653, 124240), (1306, 62120), (1553, 52240), (2612, 31060), (3106, 26120), (3265, 24848), (5224, 15530), (6212, 13060), (6530, 12424), (7765, 10448)]