20663680

素因数分解:

$2^7\times 5^1\times {\mathrm{83}}^1\times {\mathrm{389}}^1$

素因数の和:491

約数の個数: 64

約数和(自身を含む): 50122800

約数和(自身を除く): 29459120

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 83, 128, 160, 166, 320, 332, 389, 415, 640, 664, 778, 830, 1328, 1556, 1660, 1945, 2656, 3112, 3320, 3890, 5312, 6224, 6640, 7780, 10624, 12448, 13280, 15560, 24896, 26560, 31120, 32287, 49792, 53120, 62240, 64574, 124480, 129148, 161435, 248960, 258296, 322870, 516592, 645740, 1033184, 1291480, 2066368, 2582960, 4132736, 5165920, 10331840, 20663680]

約数ペア:

[(1, 20663680), (2, 10331840), (4, 5165920), (5, 4132736), (8, 2582960), (10, 2066368), (16, 1291480), (20, 1033184), (32, 645740), (40, 516592), (64, 322870), (80, 258296), (83, 248960), (128, 161435), (160, 129148), (166, 124480), (320, 64574), (332, 62240), (389, 53120), (415, 49792), (640, 32287), (664, 31120), (778, 26560), (830, 24896), (1328, 15560), (1556, 13280), (1660, 12448), (1945, 10624), (2656, 7780), (3112, 6640), (3320, 6224), (3890, 5312)]