20999860

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{61}}^1\times {\mathrm{2459}}^1$

素因数の和:2536

約数の個数: 48

約数和(自身を含む): 51246720

約数和(自身を除く): 30246860

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 61, 70, 122, 140, 244, 305, 427, 610, 854, 1220, 1708, 2135, 2459, 4270, 4918, 8540, 9836, 12295, 17213, 24590, 34426, 49180, 68852, 86065, 149999, 172130, 299998, 344260, 599996, 749995, 1049993, 1499990, 2099986, 2999980, 4199972, 5249965, 10499930, 20999860]

約数ペア:

[(1, 20999860), (2, 10499930), (4, 5249965), (5, 4199972), (7, 2999980), (10, 2099986), (14, 1499990), (20, 1049993), (28, 749995), (35, 599996), (61, 344260), (70, 299998), (122, 172130), (140, 149999), (244, 86065), (305, 68852), (427, 49180), (610, 34426), (854, 24590), (1220, 17213), (1708, 12295), (2135, 9836), (2459, 8540), (4270, 4918)]