19780480

素因数分解:

$2^7\times 5^1\times {\mathrm{31}}^1\times {\mathrm{997}}^1$

素因数の和:1047

約数の個数: 64

約数和(自身を含む): 48862080

約数和(自身を除く): 29081600

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, 992, 997, 1240, 1984, 1994, 2480, 3968, 3988, 4960, 4985, 7976, 9920, 9970, 15952, 19840, 19940, 30907, 31904, 39880, 61814, 63808, 79760, 123628, 127616, 154535, 159520, 247256, 309070, 319040, 494512, 618140, 638080, 989024, 1236280, 1978048, 2472560, 3956096, 4945120, 9890240, 19780480]

約数ペア:

[(1, 19780480), (2, 9890240), (4, 4945120), (5, 3956096), (8, 2472560), (10, 1978048), (16, 1236280), (20, 989024), (31, 638080), (32, 618140), (40, 494512), (62, 319040), (64, 309070), (80, 247256), (124, 159520), (128, 154535), (155, 127616), (160, 123628), (248, 79760), (310, 63808), (320, 61814), (496, 39880), (620, 31904), (640, 30907), (992, 19940), (997, 19840), (1240, 15952), (1984, 9970), (1994, 9920), (2480, 7976), (3968, 4985), (3988, 4960)]