216508725

素因数分解:

$3^2\times 5^2\times {\mathrm{971}}^1\times {\mathrm{991}}^1$

素因数の和:1978

約数の個数: 36

約数和(自身を含む): 388582272

約数和(自身を除く): 172073547

約数列:

[1, 3, 5, 9, 15, 25, 45, 75, 225, 971, 991, 2913, 2973, 4855, 4955, 8739, 8919, 14565, 14865, 24275, 24775, 43695, 44595, 72825, 74325, 218475, 222975, 962261, 2886783, 4811305, 8660349, 14433915, 24056525, 43301745, 72169575, 216508725]

約数ペア:

[(1, 216508725), (3, 72169575), (5, 43301745), (9, 24056525), (15, 14433915), (25, 8660349), (45, 4811305), (75, 2886783), (225, 962261), (971, 222975), (991, 218475), (2913, 74325), (2973, 72825), (4855, 44595), (4955, 43695), (8739, 24775), (8919, 24275), (14565, 14865)]