20810920

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{1291}}^1$

素因数の和:1346

約数の個数: 64

約数和(自身を含む): 52093440

約数和(自身を除く): 31282520

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 31, 40, 52, 62, 65, 104, 124, 130, 155, 248, 260, 310, 403, 520, 620, 806, 1240, 1291, 1612, 2015, 2582, 3224, 4030, 5164, 6455, 8060, 10328, 12910, 16120, 16783, 25820, 33566, 40021, 51640, 67132, 80042, 83915, 134264, 160084, 167830, 200105, 320168, 335660, 400210, 520273, 671320, 800420, 1040546, 1600840, 2081092, 2601365, 4162184, 5202730, 10405460, 20810920]

約数ペア:

[(1, 20810920), (2, 10405460), (4, 5202730), (5, 4162184), (8, 2601365), (10, 2081092), (13, 1600840), (20, 1040546), (26, 800420), (31, 671320), (40, 520273), (52, 400210), (62, 335660), (65, 320168), (104, 200105), (124, 167830), (130, 160084), (155, 134264), (248, 83915), (260, 80042), (310, 67132), (403, 51640), (520, 40021), (620, 33566), (806, 25820), (1240, 16783), (1291, 16120), (1612, 12910), (2015, 10328), (2582, 8060), (3224, 6455), (4030, 5164)]