19978244

素因数分解:

$2^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{659}}^1$

素因数の和:740

約数の個数: 48

約数和(自身を含む): 41912640

約数和(自身を除く): 21934396

約数列:

[1, 2, 4, 11, 13, 22, 26, 44, 52, 53, 106, 143, 212, 286, 572, 583, 659, 689, 1166, 1318, 1378, 2332, 2636, 2756, 7249, 7579, 8567, 14498, 15158, 17134, 28996, 30316, 34268, 34927, 69854, 94237, 139708, 188474, 376948, 384197, 454051, 768394, 908102, 1536788, 1816204, 4994561, 9989122, 19978244]

約数ペア:

[(1, 19978244), (2, 9989122), (4, 4994561), (11, 1816204), (13, 1536788), (22, 908102), (26, 768394), (44, 454051), (52, 384197), (53, 376948), (106, 188474), (143, 139708), (212, 94237), (286, 69854), (572, 34927), (583, 34268), (659, 30316), (689, 28996), (1166, 17134), (1318, 15158), (1378, 14498), (2332, 8567), (2636, 7579), (2756, 7249)]