20789980

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{1301}}^1$

素因数の和:1374

約数の個数: 48

約数和(自身を含む): 47246976

約数和(自身を除く): 26456996

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 47, 68, 85, 94, 170, 188, 235, 340, 470, 799, 940, 1301, 1598, 2602, 3196, 3995, 5204, 6505, 7990, 13010, 15980, 22117, 26020, 44234, 61147, 88468, 110585, 122294, 221170, 244588, 305735, 442340, 611470, 1039499, 1222940, 2078998, 4157996, 5197495, 10394990, 20789980]

約数ペア:

[(1, 20789980), (2, 10394990), (4, 5197495), (5, 4157996), (10, 2078998), (17, 1222940), (20, 1039499), (34, 611470), (47, 442340), (68, 305735), (85, 244588), (94, 221170), (170, 122294), (188, 110585), (235, 88468), (340, 61147), (470, 44234), (799, 26020), (940, 22117), (1301, 15980), (1598, 13010), (2602, 7990), (3196, 6505), (3995, 5204)]