18997840

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{229}}^1$

素因数の和:320

約数の個数: 80

約数和(自身を含む): 47742480

約数和(自身を除く): 28744640

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 61, 68, 80, 85, 122, 136, 170, 229, 244, 272, 305, 340, 458, 488, 610, 680, 916, 976, 1037, 1145, 1220, 1360, 1832, 2074, 2290, 2440, 3664, 3893, 4148, 4580, 4880, 5185, 7786, 8296, 9160, 10370, 13969, 15572, 16592, 18320, 19465, 20740, 27938, 31144, 38930, 41480, 55876, 62288, 69845, 77860, 82960, 111752, 139690, 155720, 223504, 237473, 279380, 311440, 474946, 558760, 949892, 1117520, 1187365, 1899784, 2374730, 3799568, 4749460, 9498920, 18997840]

約数ペア:

[(1, 18997840), (2, 9498920), (4, 4749460), (5, 3799568), (8, 2374730), (10, 1899784), (16, 1187365), (17, 1117520), (20, 949892), (34, 558760), (40, 474946), (61, 311440), (68, 279380), (80, 237473), (85, 223504), (122, 155720), (136, 139690), (170, 111752), (229, 82960), (244, 77860), (272, 69845), (305, 62288), (340, 55876), (458, 41480), (488, 38930), (610, 31144), (680, 27938), (916, 20740), (976, 19465), (1037, 18320), (1145, 16592), (1220, 15572), (1360, 13969), (1832, 10370), (2074, 9160), (2290, 8296), (2440, 7786), (3664, 5185), (3893, 4880), (4148, 4580)]