21820040

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{101}}^1\times {\mathrm{491}}^1$

素因数の和:614

約数の個数: 64

約数和(自身を含む): 54198720

約数和(自身を除く): 32378680

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 101, 110, 202, 220, 404, 440, 491, 505, 808, 982, 1010, 1111, 1964, 2020, 2222, 2455, 3928, 4040, 4444, 4910, 5401, 5555, 8888, 9820, 10802, 11110, 19640, 21604, 22220, 27005, 43208, 44440, 49591, 54010, 99182, 108020, 198364, 216040, 247955, 396728, 495910, 545501, 991820, 1091002, 1983640, 2182004, 2727505, 4364008, 5455010, 10910020, 21820040]

約数ペア:

[(1, 21820040), (2, 10910020), (4, 5455010), (5, 4364008), (8, 2727505), (10, 2182004), (11, 1983640), (20, 1091002), (22, 991820), (40, 545501), (44, 495910), (55, 396728), (88, 247955), (101, 216040), (110, 198364), (202, 108020), (220, 99182), (404, 54010), (440, 49591), (491, 44440), (505, 43208), (808, 27005), (982, 22220), (1010, 21604), (1111, 19640), (1964, 11110), (2020, 10802), (2222, 9820), (2455, 8888), (3928, 5555), (4040, 5401), (4444, 4910)]