21533840

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{457}}^1$

素因数の和:520

約数の個数: 80

約数和(自身を含む): 54520320

約数和(自身を除く): 32986480

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 31, 38, 40, 62, 76, 80, 95, 124, 152, 155, 190, 248, 304, 310, 380, 457, 496, 589, 620, 760, 914, 1178, 1240, 1520, 1828, 2285, 2356, 2480, 2945, 3656, 4570, 4712, 5890, 7312, 8683, 9140, 9424, 11780, 14167, 17366, 18280, 23560, 28334, 34732, 36560, 43415, 47120, 56668, 69464, 70835, 86830, 113336, 138928, 141670, 173660, 226672, 269173, 283340, 347320, 538346, 566680, 694640, 1076692, 1133360, 1345865, 2153384, 2691730, 4306768, 5383460, 10766920, 21533840]

約数ペア:

[(1, 21533840), (2, 10766920), (4, 5383460), (5, 4306768), (8, 2691730), (10, 2153384), (16, 1345865), (19, 1133360), (20, 1076692), (31, 694640), (38, 566680), (40, 538346), (62, 347320), (76, 283340), (80, 269173), (95, 226672), (124, 173660), (152, 141670), (155, 138928), (190, 113336), (248, 86830), (304, 70835), (310, 69464), (380, 56668), (457, 47120), (496, 43415), (589, 36560), (620, 34732), (760, 28334), (914, 23560), (1178, 18280), (1240, 17366), (1520, 14167), (1828, 11780), (2285, 9424), (2356, 9140), (2480, 8683), (2945, 7312), (3656, 5890), (4570, 4712)]