20821580

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{1511}}^1$

素因数の和:1586

約数の個数: 48

約数和(自身を含む): 48009024

約数和(自身を除く): 27187444

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 53, 65, 106, 130, 212, 260, 265, 530, 689, 1060, 1378, 1511, 2756, 3022, 3445, 6044, 6890, 7555, 13780, 15110, 19643, 30220, 39286, 78572, 80083, 98215, 160166, 196430, 320332, 392860, 400415, 800830, 1041079, 1601660, 2082158, 4164316, 5205395, 10410790, 20821580]

約数ペア:

[(1, 20821580), (2, 10410790), (4, 5205395), (5, 4164316), (10, 2082158), (13, 1601660), (20, 1041079), (26, 800830), (52, 400415), (53, 392860), (65, 320332), (106, 196430), (130, 160166), (212, 98215), (260, 80083), (265, 78572), (530, 39286), (689, 30220), (1060, 19643), (1378, 15110), (1511, 13780), (2756, 7555), (3022, 6890), (3445, 6044)]