19978720

素因数分解:

$2^5\times 5^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{89}}^1$

素因数の和:188

約数の個数: 96

約数和(自身を含む): 50621760

約数和(自身を除く): 30643040

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 32, 40, 46, 61, 80, 89, 92, 115, 122, 160, 178, 184, 230, 244, 305, 356, 368, 445, 460, 488, 610, 712, 736, 890, 920, 976, 1220, 1403, 1424, 1780, 1840, 1952, 2047, 2440, 2806, 2848, 3560, 3680, 4094, 4880, 5429, 5612, 7015, 7120, 8188, 9760, 10235, 10858, 11224, 14030, 14240, 16376, 20470, 21716, 22448, 27145, 28060, 32752, 40940, 43432, 44896, 54290, 56120, 65504, 81880, 86864, 108580, 112240, 124867, 163760, 173728, 217160, 224480, 249734, 327520, 434320, 499468, 624335, 868640, 998936, 1248670, 1997872, 2497340, 3995744, 4994680, 9989360, 19978720]

約数ペア:

[(1, 19978720), (2, 9989360), (4, 4994680), (5, 3995744), (8, 2497340), (10, 1997872), (16, 1248670), (20, 998936), (23, 868640), (32, 624335), (40, 499468), (46, 434320), (61, 327520), (80, 249734), (89, 224480), (92, 217160), (115, 173728), (122, 163760), (160, 124867), (178, 112240), (184, 108580), (230, 86864), (244, 81880), (305, 65504), (356, 56120), (368, 54290), (445, 44896), (460, 43432), (488, 40940), (610, 32752), (712, 28060), (736, 27145), (890, 22448), (920, 21716), (976, 20470), (1220, 16376), (1403, 14240), (1424, 14030), (1780, 11224), (1840, 10858), (1952, 10235), (2047, 9760), (2440, 8188), (2806, 7120), (2848, 7015), (3560, 5612), (3680, 5429), (4094, 4880)]