643760

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{619}}^1$

素因数の和:645

約数の個数: 40

約数和(自身を含む): 1614480

約数和(自身を除く): 970720

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 619, 1040, 1238, 2476, 3095, 4952, 6190, 8047, 9904, 12380, 16094, 24760, 32188, 40235, 49520, 64376, 80470, 128752, 160940, 321880, 643760]

約数ペア:

[(1, 643760), (2, 321880), (4, 160940), (5, 128752), (8, 80470), (10, 64376), (13, 49520), (16, 40235), (20, 32188), (26, 24760), (40, 16094), (52, 12380), (65, 9904), (80, 8047), (104, 6190), (130, 4952), (208, 3095), (260, 2476), (520, 1238), (619, 1040)]