19661440

素因数分解:

$2^7\times 5^1\times {\mathrm{31}}^1\times {\mathrm{991}}^1$

素因数の和:1041

約数の個数: 64

約数和(自身を含む): 48568320

約数和(自身を除く): 28906880

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 310, 320, 496, 620, 640, 991, 992, 1240, 1982, 1984, 2480, 3964, 3968, 4955, 4960, 7928, 9910, 9920, 15856, 19820, 19840, 30721, 31712, 39640, 61442, 63424, 79280, 122884, 126848, 153605, 158560, 245768, 307210, 317120, 491536, 614420, 634240, 983072, 1228840, 1966144, 2457680, 3932288, 4915360, 9830720, 19661440]

約数ペア:

[(1, 19661440), (2, 9830720), (4, 4915360), (5, 3932288), (8, 2457680), (10, 1966144), (16, 1228840), (20, 983072), (31, 634240), (32, 614420), (40, 491536), (62, 317120), (64, 307210), (80, 245768), (124, 158560), (128, 153605), (155, 126848), (160, 122884), (248, 79280), (310, 63424), (320, 61442), (496, 39640), (620, 31712), (640, 30721), (991, 19840), (992, 19820), (1240, 15856), (1982, 9920), (1984, 9910), (2480, 7928), (3964, 4960), (3968, 4955)]