21681920

素因数分解:

$2^8\times 5^1\times {\mathrm{13}}^1\times {\mathrm{1303}}^1$

素因数の和:1337

約数の個数: 72

約数和(自身を含む): 55972896

約数和(自身を除く): 34290976

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 208, 256, 260, 320, 416, 520, 640, 832, 1040, 1280, 1303, 1664, 2080, 2606, 3328, 4160, 5212, 6515, 8320, 10424, 13030, 16640, 16939, 20848, 26060, 33878, 41696, 52120, 67756, 83392, 84695, 104240, 135512, 166784, 169390, 208480, 271024, 333568, 338780, 416960, 542048, 677560, 833920, 1084096, 1355120, 1667840, 2168192, 2710240, 4336384, 5420480, 10840960, 21681920]

約数ペア:

[(1, 21681920), (2, 10840960), (4, 5420480), (5, 4336384), (8, 2710240), (10, 2168192), (13, 1667840), (16, 1355120), (20, 1084096), (26, 833920), (32, 677560), (40, 542048), (52, 416960), (64, 338780), (65, 333568), (80, 271024), (104, 208480), (128, 169390), (130, 166784), (160, 135512), (208, 104240), (256, 84695), (260, 83392), (320, 67756), (416, 52120), (520, 41696), (640, 33878), (832, 26060), (1040, 20848), (1280, 16939), (1303, 16640), (1664, 13030), (2080, 10424), (2606, 8320), (3328, 6515), (4160, 5212)]