20418920

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{67}}^1\times {\mathrm{401}}^1$

素因数の和:498

約数の個数: 64

約数和(自身を含む): 49204800

約数和(自身を除く): 28785880

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 67, 76, 95, 134, 152, 190, 268, 335, 380, 401, 536, 670, 760, 802, 1273, 1340, 1604, 2005, 2546, 2680, 3208, 4010, 5092, 6365, 7619, 8020, 10184, 12730, 15238, 16040, 25460, 26867, 30476, 38095, 50920, 53734, 60952, 76190, 107468, 134335, 152380, 214936, 268670, 304760, 510473, 537340, 1020946, 1074680, 2041892, 2552365, 4083784, 5104730, 10209460, 20418920]

約数ペア:

[(1, 20418920), (2, 10209460), (4, 5104730), (5, 4083784), (8, 2552365), (10, 2041892), (19, 1074680), (20, 1020946), (38, 537340), (40, 510473), (67, 304760), (76, 268670), (95, 214936), (134, 152380), (152, 134335), (190, 107468), (268, 76190), (335, 60952), (380, 53734), (401, 50920), (536, 38095), (670, 30476), (760, 26867), (802, 25460), (1273, 16040), (1340, 15238), (1604, 12730), (2005, 10184), (2546, 8020), (2680, 7619), (3208, 6365), (4010, 5092)]