21021570245

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{103}}^1\times {\mathrm{211}}^1\times {\mathrm{647}}^1$

素因数の和:1002

約数の個数: 64

約数和(自身を含む): 28802801664

約数和(自身を除く): 7781231419

約数列:

[1, 5, 13, 23, 65, 103, 115, 211, 299, 515, 647, 1055, 1339, 1495, 2369, 2743, 3235, 4853, 6695, 8411, 11845, 13715, 14881, 21733, 24265, 30797, 42055, 63089, 66641, 74405, 108665, 136517, 153985, 193453, 282529, 315445, 333205, 499859, 682585, 866333, 967265, 1412645, 1532743, 1774721, 2499295, 3139891, 4331665, 6498167, 7663715, 8873605, 14061251, 15699455, 19925659, 32490835, 40818583, 70306255, 99628295, 182796263, 204092915, 323408773, 913981315, 1617043865, 4204314049, 21021570245]

約数ペア:

[(1, 21021570245), (5, 4204314049), (13, 1617043865), (23, 913981315), (65, 323408773), (103, 204092915), (115, 182796263), (211, 99628295), (299, 70306255), (515, 40818583), (647, 32490835), (1055, 19925659), (1339, 15699455), (1495, 14061251), (2369, 8873605), (2743, 7663715), (3235, 6498167), (4853, 4331665), (6695, 3139891), (8411, 2499295), (11845, 1774721), (13715, 1532743), (14881, 1412645), (21733, 967265), (24265, 866333), (30797, 682585), (42055, 499859), (63089, 333205), (66641, 315445), (74405, 282529), (108665, 193453), (136517, 153985)]