20814920

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{79}}^1\times {\mathrm{941}}^1$

素因数の和:1038

約数の個数: 64

約数和(自身を含む): 54259200

約数和(自身を除く): 33444280

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 79, 140, 158, 280, 316, 395, 553, 632, 790, 941, 1106, 1580, 1882, 2212, 2765, 3160, 3764, 4424, 4705, 5530, 6587, 7528, 9410, 11060, 13174, 18820, 22120, 26348, 32935, 37640, 52696, 65870, 74339, 131740, 148678, 263480, 297356, 371695, 520373, 594712, 743390, 1040746, 1486780, 2081492, 2601865, 2973560, 4162984, 5203730, 10407460, 20814920]

約数ペア:

[(1, 20814920), (2, 10407460), (4, 5203730), (5, 4162984), (7, 2973560), (8, 2601865), (10, 2081492), (14, 1486780), (20, 1040746), (28, 743390), (35, 594712), (40, 520373), (56, 371695), (70, 297356), (79, 263480), (140, 148678), (158, 131740), (280, 74339), (316, 65870), (395, 52696), (553, 37640), (632, 32935), (790, 26348), (941, 22120), (1106, 18820), (1580, 13174), (1882, 11060), (2212, 9410), (2765, 7528), (3160, 6587), (3764, 5530), (4424, 4705)]