20417920

素因数分解:

$2^7\times 5^1\times {\mathrm{61}}^1\times {\mathrm{523}}^1$

素因数の和:603

約数の個数: 64

約数和(自身を含む): 49706640

約数和(自身を除く): 29288720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 61, 64, 80, 122, 128, 160, 244, 305, 320, 488, 523, 610, 640, 976, 1046, 1220, 1952, 2092, 2440, 2615, 3904, 4184, 4880, 5230, 7808, 8368, 9760, 10460, 16736, 19520, 20920, 31903, 33472, 39040, 41840, 63806, 66944, 83680, 127612, 159515, 167360, 255224, 319030, 334720, 510448, 638060, 1020896, 1276120, 2041792, 2552240, 4083584, 5104480, 10208960, 20417920]

約数ペア:

[(1, 20417920), (2, 10208960), (4, 5104480), (5, 4083584), (8, 2552240), (10, 2041792), (16, 1276120), (20, 1020896), (32, 638060), (40, 510448), (61, 334720), (64, 319030), (80, 255224), (122, 167360), (128, 159515), (160, 127612), (244, 83680), (305, 66944), (320, 63806), (488, 41840), (523, 39040), (610, 33472), (640, 31903), (976, 20920), (1046, 19520), (1220, 16736), (1952, 10460), (2092, 9760), (2440, 8368), (2615, 7808), (3904, 5230), (4184, 4880)]