20419984

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{5167}}^1$

素因数の和:5207

約数の個数: 40

約数和(自身を含む): 44858240

約数和(自身を除く): 24438256

約数列:

[1, 2, 4, 8, 13, 16, 19, 26, 38, 52, 76, 104, 152, 208, 247, 304, 494, 988, 1976, 3952, 5167, 10334, 20668, 41336, 67171, 82672, 98173, 134342, 196346, 268684, 392692, 537368, 785384, 1074736, 1276249, 1570768, 2552498, 5104996, 10209992, 20419984]

約数ペア:

[(1, 20419984), (2, 10209992), (4, 5104996), (8, 2552498), (13, 1570768), (16, 1276249), (19, 1074736), (26, 785384), (38, 537368), (52, 392692), (76, 268684), (104, 196346), (152, 134342), (208, 98173), (247, 82672), (304, 67171), (494, 41336), (988, 20668), (1976, 10334), (3952, 5167)]