21621875

素因数分解:

$5^5\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1$

素因数の和:90

約数の個数: 48

約数和(自身を含む): 32060448

約数和(自身を除く): 10438573

約数列:

[1, 5, 11, 17, 25, 37, 55, 85, 125, 185, 187, 275, 407, 425, 625, 629, 925, 935, 1375, 2035, 2125, 3125, 3145, 4625, 4675, 6875, 6919, 10175, 10625, 15725, 23125, 23375, 34375, 34595, 50875, 53125, 78625, 115625, 116875, 172975, 254375, 393125, 584375, 864875, 1271875, 1965625, 4324375, 21621875]

約数ペア:

[(1, 21621875), (5, 4324375), (11, 1965625), (17, 1271875), (25, 864875), (37, 584375), (55, 393125), (85, 254375), (125, 172975), (185, 116875), (187, 115625), (275, 78625), (407, 53125), (425, 50875), (625, 34595), (629, 34375), (925, 23375), (935, 23125), (1375, 15725), (2035, 10625), (2125, 10175), (3125, 6919), (3145, 6875), (4625, 4675)]