20987772

素因数分解:

$2^2\times 3^1\times {\mathrm{13}}^2\times {\mathrm{79}}^1\times {\mathrm{131}}^1$

素因数の和:243

約数の個数: 72

約数和(自身を含む): 54109440

約数和(自身を除く): 33121668

約数列:

[1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 79, 131, 156, 158, 169, 237, 262, 316, 338, 393, 474, 507, 524, 676, 786, 948, 1014, 1027, 1572, 1703, 2028, 2054, 3081, 3406, 4108, 5109, 6162, 6812, 10218, 10349, 12324, 13351, 20436, 20698, 22139, 26702, 31047, 40053, 41396, 44278, 53404, 62094, 66417, 80106, 88556, 124188, 132834, 134537, 160212, 265668, 269074, 403611, 538148, 807222, 1614444, 1748981, 3497962, 5246943, 6995924, 10493886, 20987772]

約数ペア:

[(1, 20987772), (2, 10493886), (3, 6995924), (4, 5246943), (6, 3497962), (12, 1748981), (13, 1614444), (26, 807222), (39, 538148), (52, 403611), (78, 269074), (79, 265668), (131, 160212), (156, 134537), (158, 132834), (169, 124188), (237, 88556), (262, 80106), (316, 66417), (338, 62094), (393, 53404), (474, 44278), (507, 41396), (524, 40053), (676, 31047), (786, 26702), (948, 22139), (1014, 20698), (1027, 20436), (1572, 13351), (1703, 12324), (2028, 10349), (2054, 10218), (3081, 6812), (3406, 6162), (4108, 5109)]