20789955

素因数分解:

$3^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{89}}^1\times {\mathrm{179}}^1$

素因数の和:308

約数の個数: 48

約数和(自身を含む): 37908000

約数和(自身を除く): 17118045

約数列:

[1, 3, 5, 9, 15, 29, 45, 87, 89, 145, 179, 261, 267, 435, 445, 537, 801, 895, 1305, 1335, 1611, 2581, 2685, 4005, 5191, 7743, 8055, 12905, 15573, 15931, 23229, 25955, 38715, 46719, 47793, 77865, 79655, 116145, 143379, 233595, 238965, 461999, 716895, 1385997, 2309995, 4157991, 6929985, 20789955]

約数ペア:

[(1, 20789955), (3, 6929985), (5, 4157991), (9, 2309995), (15, 1385997), (29, 716895), (45, 461999), (87, 238965), (89, 233595), (145, 143379), (179, 116145), (261, 79655), (267, 77865), (435, 47793), (445, 46719), (537, 38715), (801, 25955), (895, 23229), (1305, 15931), (1335, 15573), (1611, 12905), (2581, 8055), (2685, 7743), (4005, 5191)]