21231320

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{73}}^1\times {\mathrm{661}}^1$

素因数の和:756

約数の個数: 64

約数和(自身を含む): 52907040

約数和(自身を除く): 31675720

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 73, 88, 110, 146, 220, 292, 365, 440, 584, 661, 730, 803, 1322, 1460, 1606, 2644, 2920, 3212, 3305, 4015, 5288, 6424, 6610, 7271, 8030, 13220, 14542, 16060, 26440, 29084, 32120, 36355, 48253, 58168, 72710, 96506, 145420, 193012, 241265, 290840, 386024, 482530, 530783, 965060, 1061566, 1930120, 2123132, 2653915, 4246264, 5307830, 10615660, 21231320]

約数ペア:

[(1, 21231320), (2, 10615660), (4, 5307830), (5, 4246264), (8, 2653915), (10, 2123132), (11, 1930120), (20, 1061566), (22, 965060), (40, 530783), (44, 482530), (55, 386024), (73, 290840), (88, 241265), (110, 193012), (146, 145420), (220, 96506), (292, 72710), (365, 58168), (440, 48253), (584, 36355), (661, 32120), (730, 29084), (803, 26440), (1322, 16060), (1460, 14542), (1606, 13220), (2644, 8030), (2920, 7271), (3212, 6610), (3305, 6424), (4015, 5288)]