81431320

素因数分解:

$2^3\times 5^1\times {\mathrm{53}}^1\times {\mathrm{71}}^1\times {\mathrm{541}}^1$

素因数の和:676

約数の個数: 64

約数和(自身を含む): 189656640

約数和(自身を除く): 108225320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 53, 71, 106, 142, 212, 265, 284, 355, 424, 530, 541, 568, 710, 1060, 1082, 1420, 2120, 2164, 2705, 2840, 3763, 4328, 5410, 7526, 10820, 15052, 18815, 21640, 28673, 30104, 37630, 38411, 57346, 75260, 76822, 114692, 143365, 150520, 153644, 192055, 229384, 286730, 307288, 384110, 573460, 768220, 1146920, 1536440, 2035783, 4071566, 8143132, 10178915, 16286264, 20357830, 40715660, 81431320]

約数ペア:

[(1, 81431320), (2, 40715660), (4, 20357830), (5, 16286264), (8, 10178915), (10, 8143132), (20, 4071566), (40, 2035783), (53, 1536440), (71, 1146920), (106, 768220), (142, 573460), (212, 384110), (265, 307288), (284, 286730), (355, 229384), (424, 192055), (530, 153644), (541, 150520), (568, 143365), (710, 114692), (1060, 76822), (1082, 75260), (1420, 57346), (2120, 38411), (2164, 37630), (2705, 30104), (2840, 28673), (3763, 21640), (4328, 18815), (5410, 15052), (7526, 10820)]