21400340

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{1553}}^1$

素因数の和:1628

約数の個数: 48

約数和(自身を含む): 49342608

約数和(自身を除く): 27942268

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 53, 65, 106, 130, 212, 260, 265, 530, 689, 1060, 1378, 1553, 2756, 3106, 3445, 6212, 6890, 7765, 13780, 15530, 20189, 31060, 40378, 80756, 82309, 100945, 164618, 201890, 329236, 403780, 411545, 823090, 1070017, 1646180, 2140034, 4280068, 5350085, 10700170, 21400340]

約数ペア:

[(1, 21400340), (2, 10700170), (4, 5350085), (5, 4280068), (10, 2140034), (13, 1646180), (20, 1070017), (26, 823090), (52, 411545), (53, 403780), (65, 329236), (106, 201890), (130, 164618), (212, 100945), (260, 82309), (265, 80756), (530, 40378), (689, 31060), (1060, 20189), (1378, 15530), (1553, 13780), (2756, 7765), (3106, 6890), (3445, 6212)]