19640980

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{401}}^1$

素因数の和:520

約数の個数: 48

約数和(自身を含む): 43223040

約数和(自身を除く): 23582060

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 79, 124, 155, 158, 310, 316, 395, 401, 620, 790, 802, 1580, 1604, 2005, 2449, 4010, 4898, 8020, 9796, 12245, 12431, 24490, 24862, 31679, 48980, 49724, 62155, 63358, 124310, 126716, 158395, 248620, 316790, 633580, 982049, 1964098, 3928196, 4910245, 9820490, 19640980]

約数ペア:

[(1, 19640980), (2, 9820490), (4, 4910245), (5, 3928196), (10, 1964098), (20, 982049), (31, 633580), (62, 316790), (79, 248620), (124, 158395), (155, 126716), (158, 124310), (310, 63358), (316, 62155), (395, 49724), (401, 48980), (620, 31679), (790, 24862), (802, 24490), (1580, 12431), (1604, 12245), (2005, 9796), (2449, 8020), (4010, 4898)]