21235480

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{509}}^1$

素因数の和:676

約数の個数: 64

約数和(自身を含む): 55080000

約数和(自身を除く): 33844520

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 149, 280, 298, 509, 596, 745, 1018, 1043, 1192, 1490, 2036, 2086, 2545, 2980, 3563, 4072, 4172, 5090, 5215, 5960, 7126, 8344, 10180, 10430, 14252, 17815, 20360, 20860, 28504, 35630, 41720, 71260, 75841, 142520, 151682, 303364, 379205, 530887, 606728, 758410, 1061774, 1516820, 2123548, 2654435, 3033640, 4247096, 5308870, 10617740, 21235480]

約数ペア:

[(1, 21235480), (2, 10617740), (4, 5308870), (5, 4247096), (7, 3033640), (8, 2654435), (10, 2123548), (14, 1516820), (20, 1061774), (28, 758410), (35, 606728), (40, 530887), (56, 379205), (70, 303364), (140, 151682), (149, 142520), (280, 75841), (298, 71260), (509, 41720), (596, 35630), (745, 28504), (1018, 20860), (1043, 20360), (1192, 17815), (1490, 14252), (2036, 10430), (2086, 10180), (2545, 8344), (2980, 7126), (3563, 5960), (4072, 5215), (4172, 5090)]