21545120

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{89}}^2$

素因数の和:210

約数の個数: 72

約数和(自身を含む): 54506844

約数和(自身を除く): 32961724

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 68, 80, 85, 89, 136, 160, 170, 178, 272, 340, 356, 445, 544, 680, 712, 890, 1360, 1424, 1513, 1780, 2720, 2848, 3026, 3560, 6052, 7120, 7565, 7921, 12104, 14240, 15130, 15842, 24208, 30260, 31684, 39605, 48416, 60520, 63368, 79210, 121040, 126736, 134657, 158420, 242080, 253472, 269314, 316840, 538628, 633680, 673285, 1077256, 1267360, 1346570, 2154512, 2693140, 4309024, 5386280, 10772560, 21545120]

約数ペア:

[(1, 21545120), (2, 10772560), (4, 5386280), (5, 4309024), (8, 2693140), (10, 2154512), (16, 1346570), (17, 1267360), (20, 1077256), (32, 673285), (34, 633680), (40, 538628), (68, 316840), (80, 269314), (85, 253472), (89, 242080), (136, 158420), (160, 134657), (170, 126736), (178, 121040), (272, 79210), (340, 63368), (356, 60520), (445, 48416), (544, 39605), (680, 31684), (712, 30260), (890, 24208), (1360, 15842), (1424, 15130), (1513, 14240), (1780, 12104), (2720, 7921), (2848, 7565), (3026, 7120), (3560, 6052)]