20719760

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6317}}^1$

素因数の和:6371

約数の個数: 40

約数和(自身を含む): 49356216

約数和(自身を除く): 28636456

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6317, 12634, 25268, 31585, 50536, 63170, 101072, 126340, 252680, 258997, 505360, 517994, 1035988, 1294985, 2071976, 2589970, 4143952, 5179940, 10359880, 20719760]

約数ペア:

[(1, 20719760), (2, 10359880), (4, 5179940), (5, 4143952), (8, 2589970), (10, 2071976), (16, 1294985), (20, 1035988), (40, 517994), (41, 505360), (80, 258997), (82, 252680), (164, 126340), (205, 101072), (328, 63170), (410, 50536), (656, 31585), (820, 25268), (1640, 12634), (3280, 6317)]