19997440

素因数分解:

$2^8\times 5^1\times {\mathrm{17}}^1\times {\mathrm{919}}^1$

素因数の和:957

約数の個数: 72

約数和(自身を含む): 50772960

約数和(自身を除く): 30775520

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 64, 68, 80, 85, 128, 136, 160, 170, 256, 272, 320, 340, 544, 640, 680, 919, 1088, 1280, 1360, 1838, 2176, 2720, 3676, 4352, 4595, 5440, 7352, 9190, 10880, 14704, 15623, 18380, 21760, 29408, 31246, 36760, 58816, 62492, 73520, 78115, 117632, 124984, 147040, 156230, 235264, 249968, 294080, 312460, 499936, 588160, 624920, 999872, 1176320, 1249840, 1999744, 2499680, 3999488, 4999360, 9998720, 19997440]

約数ペア:

[(1, 19997440), (2, 9998720), (4, 4999360), (5, 3999488), (8, 2499680), (10, 1999744), (16, 1249840), (17, 1176320), (20, 999872), (32, 624920), (34, 588160), (40, 499936), (64, 312460), (68, 294080), (80, 249968), (85, 235264), (128, 156230), (136, 147040), (160, 124984), (170, 117632), (256, 78115), (272, 73520), (320, 62492), (340, 58816), (544, 36760), (640, 31246), (680, 29408), (919, 21760), (1088, 18380), (1280, 15623), (1360, 14704), (1838, 10880), (2176, 9190), (2720, 7352), (3676, 5440), (4352, 4595)]