20648420

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{41}}^1\times {\mathrm{149}}^1$

素因数の和:225

約数の個数: 72

約数和(自身を含む): 48421800

約数和(自身を除く): 27773380

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 41, 52, 65, 82, 130, 149, 164, 169, 205, 260, 298, 338, 410, 533, 596, 676, 745, 820, 845, 1066, 1490, 1690, 1937, 2132, 2665, 2980, 3380, 3874, 5330, 6109, 6929, 7748, 9685, 10660, 12218, 13858, 19370, 24436, 25181, 27716, 30545, 34645, 38740, 50362, 61090, 69290, 79417, 100724, 122180, 125905, 138580, 158834, 251810, 317668, 397085, 503620, 794170, 1032421, 1588340, 2064842, 4129684, 5162105, 10324210, 20648420]

約数ペア:

[(1, 20648420), (2, 10324210), (4, 5162105), (5, 4129684), (10, 2064842), (13, 1588340), (20, 1032421), (26, 794170), (41, 503620), (52, 397085), (65, 317668), (82, 251810), (130, 158834), (149, 138580), (164, 125905), (169, 122180), (205, 100724), (260, 79417), (298, 69290), (338, 61090), (410, 50362), (533, 38740), (596, 34645), (676, 30545), (745, 27716), (820, 25181), (845, 24436), (1066, 19370), (1490, 13858), (1690, 12218), (1937, 10660), (2132, 9685), (2665, 7748), (2980, 6929), (3380, 6109), (3874, 5330)]