20315440

素因数分解:

$2^4\times 5^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{181}}^1$

素因数の和:278

約数の個数: 80

約数和(自身を含む): 50371776

約数和(自身を除く): 30056336

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 40, 46, 61, 80, 92, 115, 122, 181, 184, 230, 244, 305, 362, 368, 460, 488, 610, 724, 905, 920, 976, 1220, 1403, 1448, 1810, 1840, 2440, 2806, 2896, 3620, 4163, 4880, 5612, 7015, 7240, 8326, 11041, 11224, 14030, 14480, 16652, 20815, 22082, 22448, 28060, 33304, 41630, 44164, 55205, 56120, 66608, 83260, 88328, 110410, 112240, 166520, 176656, 220820, 253943, 333040, 441640, 507886, 883280, 1015772, 1269715, 2031544, 2539430, 4063088, 5078860, 10157720, 20315440]

約数ペア:

[(1, 20315440), (2, 10157720), (4, 5078860), (5, 4063088), (8, 2539430), (10, 2031544), (16, 1269715), (20, 1015772), (23, 883280), (40, 507886), (46, 441640), (61, 333040), (80, 253943), (92, 220820), (115, 176656), (122, 166520), (181, 112240), (184, 110410), (230, 88328), (244, 83260), (305, 66608), (362, 56120), (368, 55205), (460, 44164), (488, 41630), (610, 33304), (724, 28060), (905, 22448), (920, 22082), (976, 20815), (1220, 16652), (1403, 14480), (1448, 14030), (1810, 11224), (1840, 11041), (2440, 8326), (2806, 7240), (2896, 7015), (3620, 5612), (4163, 4880)]