21865515

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{71}}^1\times {\mathrm{419}}^1$

素因数の和:512

約数の個数: 48

約数和(自身を含む): 41368320

約数和(自身を除く): 19502805

約数列:

[1, 3, 5, 7, 15, 21, 35, 49, 71, 105, 147, 213, 245, 355, 419, 497, 735, 1065, 1257, 1491, 2095, 2485, 2933, 3479, 6285, 7455, 8799, 10437, 14665, 17395, 20531, 29749, 43995, 52185, 61593, 89247, 102655, 148745, 208243, 307965, 446235, 624729, 1041215, 1457701, 3123645, 4373103, 7288505, 21865515]

約数ペア:

[(1, 21865515), (3, 7288505), (5, 4373103), (7, 3123645), (15, 1457701), (21, 1041215), (35, 624729), (49, 446235), (71, 307965), (105, 208243), (147, 148745), (213, 102655), (245, 89247), (355, 61593), (419, 52185), (497, 43995), (735, 29749), (1065, 20531), (1257, 17395), (1491, 14665), (2095, 10437), (2485, 8799), (2933, 7455), (3479, 6285)]