28721320

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{83}}^1\times {\mathrm{211}}^1$

素因数の和:346

約数の個数: 64

約数和(自身を含む): 67314240

約数和(自身を除く): 38592920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 83, 164, 166, 205, 211, 328, 332, 410, 415, 422, 664, 820, 830, 844, 1055, 1640, 1660, 1688, 2110, 3320, 3403, 4220, 6806, 8440, 8651, 13612, 17015, 17302, 17513, 27224, 34030, 34604, 35026, 43255, 68060, 69208, 70052, 86510, 87565, 136120, 140104, 173020, 175130, 346040, 350260, 700520, 718033, 1436066, 2872132, 3590165, 5744264, 7180330, 14360660, 28721320]

約数ペア:

[(1, 28721320), (2, 14360660), (4, 7180330), (5, 5744264), (8, 3590165), (10, 2872132), (20, 1436066), (40, 718033), (41, 700520), (82, 350260), (83, 346040), (164, 175130), (166, 173020), (205, 140104), (211, 136120), (328, 87565), (332, 86510), (410, 70052), (415, 69208), (422, 68060), (664, 43255), (820, 35026), (830, 34604), (844, 34030), (1055, 27224), (1640, 17513), (1660, 17302), (1688, 17015), (2110, 13612), (3320, 8651), (3403, 8440), (4220, 6806)]