21020004

素因数分解:

$2^2\times 3^2\times {\mathrm{19}}^1\times {\mathrm{79}}^1\times {\mathrm{389}}^1$

素因数の和:497

約数の個数: 72

約数和(自身を含む): 56784000

約数和(自身を除く): 35763996

約数列:

[1, 2, 3, 4, 6, 9, 12, 18, 19, 36, 38, 57, 76, 79, 114, 158, 171, 228, 237, 316, 342, 389, 474, 684, 711, 778, 948, 1167, 1422, 1501, 1556, 2334, 2844, 3002, 3501, 4503, 4668, 6004, 7002, 7391, 9006, 13509, 14004, 14782, 18012, 22173, 27018, 29564, 30731, 44346, 54036, 61462, 66519, 88692, 92193, 122924, 133038, 184386, 266076, 276579, 368772, 553158, 583889, 1106316, 1167778, 1751667, 2335556, 3503334, 5255001, 7006668, 10510002, 21020004]

約数ペア:

[(1, 21020004), (2, 10510002), (3, 7006668), (4, 5255001), (6, 3503334), (9, 2335556), (12, 1751667), (18, 1167778), (19, 1106316), (36, 583889), (38, 553158), (57, 368772), (76, 276579), (79, 266076), (114, 184386), (158, 133038), (171, 122924), (228, 92193), (237, 88692), (316, 66519), (342, 61462), (389, 54036), (474, 44346), (684, 30731), (711, 29564), (778, 27018), (948, 22173), (1167, 18012), (1422, 14782), (1501, 14004), (1556, 13509), (2334, 9006), (2844, 7391), (3002, 7002), (3501, 6004), (4503, 4668)]