21294520

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{1321}}^1$

素因数の和:1376

約数の個数: 64

約数和(自身を含む): 53303040

約数和(自身を除く): 32008520

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, 1321, 1612, 2015, 2642, 3224, 4030, 5284, 6605, 8060, 10568, 13210, 16120, 17173, 26420, 34346, 40951, 52840, 68692, 81902, 85865, 137384, 163804, 171730, 204755, 327608, 343460, 409510, 532363, 686920, 819020, 1064726, 1638040, 2129452, 2661815, 4258904, 5323630, 10647260, 21294520]

約数ペア:

[(1, 21294520), (2, 10647260), (4, 5323630), (5, 4258904), (8, 2661815), (10, 2129452), (13, 1638040), (20, 1064726), (26, 819020), (31, 686920), (40, 532363), (52, 409510), (62, 343460), (65, 327608), (104, 204755), (124, 171730), (130, 163804), (155, 137384), (248, 85865), (260, 81902), (310, 68692), (403, 52840), (520, 40951), (620, 34346), (806, 26420), (1240, 17173), (1321, 16120), (1612, 13210), (2015, 10568), (2642, 8060), (3224, 6605), (4030, 5284)]