81980240

素因数分解:

$2^4\times 5^1\times {\mathrm{691}}^1\times {\mathrm{1483}}^1$

素因数の和:2187

約数の個数: 40

約数和(自身を含む): 191008608

約数和(自身を除く): 109028368

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 691, 1382, 1483, 2764, 2966, 3455, 5528, 5932, 6910, 7415, 11056, 11864, 13820, 14830, 23728, 27640, 29660, 55280, 59320, 118640, 1024753, 2049506, 4099012, 5123765, 8198024, 10247530, 16396048, 20495060, 40990120, 81980240]

約数ペア:

[(1, 81980240), (2, 40990120), (4, 20495060), (5, 16396048), (8, 10247530), (10, 8198024), (16, 5123765), (20, 4099012), (40, 2049506), (80, 1024753), (691, 118640), (1382, 59320), (1483, 55280), (2764, 29660), (2966, 27640), (3455, 23728), (5528, 14830), (5932, 13820), (6910, 11864), (7415, 11056)]