20985760

素因数分解:

$2^5\times 5^1\times {\mathrm{31}}^1\times {\mathrm{4231}}^1$

素因数の和:4277

約数の個数: 48

約数和(自身を含む): 51190272

約数和(自身を除く): 30204512

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 80, 124, 155, 160, 248, 310, 496, 620, 992, 1240, 2480, 4231, 4960, 8462, 16924, 21155, 33848, 42310, 67696, 84620, 131161, 135392, 169240, 262322, 338480, 524644, 655805, 676960, 1049288, 1311610, 2098576, 2623220, 4197152, 5246440, 10492880, 20985760]

約数ペア:

[(1, 20985760), (2, 10492880), (4, 5246440), (5, 4197152), (8, 2623220), (10, 2098576), (16, 1311610), (20, 1049288), (31, 676960), (32, 655805), (40, 524644), (62, 338480), (80, 262322), (124, 169240), (155, 135392), (160, 131161), (248, 84620), (310, 67696), (496, 42310), (620, 33848), (992, 21155), (1240, 16924), (2480, 8462), (4231, 4960)]