21531580

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{127}}^1\times {\mathrm{173}}^1$

素因数の和:323

約数の個数: 72

約数和(自身を含む): 53319168

約数和(自身を除く): 31787588

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 127, 140, 173, 196, 245, 254, 346, 490, 508, 635, 692, 865, 889, 980, 1211, 1270, 1730, 1778, 2422, 2540, 3460, 3556, 4445, 4844, 6055, 6223, 8477, 8890, 12110, 12446, 16954, 17780, 21971, 24220, 24892, 31115, 33908, 42385, 43942, 62230, 84770, 87884, 109855, 124460, 153797, 169540, 219710, 307594, 439420, 615188, 768985, 1076579, 1537970, 2153158, 3075940, 4306316, 5382895, 10765790, 21531580]

約数ペア:

[(1, 21531580), (2, 10765790), (4, 5382895), (5, 4306316), (7, 3075940), (10, 2153158), (14, 1537970), (20, 1076579), (28, 768985), (35, 615188), (49, 439420), (70, 307594), (98, 219710), (127, 169540), (140, 153797), (173, 124460), (196, 109855), (245, 87884), (254, 84770), (346, 62230), (490, 43942), (508, 42385), (635, 33908), (692, 31115), (865, 24892), (889, 24220), (980, 21971), (1211, 17780), (1270, 16954), (1730, 12446), (1778, 12110), (2422, 8890), (2540, 8477), (3460, 6223), (3556, 6055), (4445, 4844)]