19979300

素因数分解:

$2^2\times 5^2\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{443}}^1$

素因数の和:509

約数の個数: 72

約数和(自身を含む): 48559392

約数和(自身を除く): 28580092

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 25, 41, 44, 50, 55, 82, 100, 110, 164, 205, 220, 275, 410, 443, 451, 550, 820, 886, 902, 1025, 1100, 1772, 1804, 2050, 2215, 2255, 4100, 4430, 4510, 4873, 8860, 9020, 9746, 11075, 11275, 18163, 19492, 22150, 22550, 24365, 36326, 44300, 45100, 48730, 72652, 90815, 97460, 121825, 181630, 199793, 243650, 363260, 399586, 454075, 487300, 799172, 908150, 998965, 1816300, 1997930, 3995860, 4994825, 9989650, 19979300]

約数ペア:

[(1, 19979300), (2, 9989650), (4, 4994825), (5, 3995860), (10, 1997930), (11, 1816300), (20, 998965), (22, 908150), (25, 799172), (41, 487300), (44, 454075), (50, 399586), (55, 363260), (82, 243650), (100, 199793), (110, 181630), (164, 121825), (205, 97460), (220, 90815), (275, 72652), (410, 48730), (443, 45100), (451, 44300), (550, 36326), (820, 24365), (886, 22550), (902, 22150), (1025, 19492), (1100, 18163), (1772, 11275), (1804, 11075), (2050, 9746), (2215, 9020), (2255, 8860), (4100, 4873), (4430, 4510)]