21300860

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{233}}^1\times {\mathrm{653}}^1$

素因数の和:902

約数の個数: 48

約数和(自身を含む): 51420096

約数和(自身を除く): 30119236

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 233, 466, 653, 932, 1165, 1306, 1631, 2330, 2612, 3262, 3265, 4571, 4660, 6524, 6530, 8155, 9142, 13060, 16310, 18284, 22855, 32620, 45710, 91420, 152149, 304298, 608596, 760745, 1065043, 1521490, 2130086, 3042980, 4260172, 5325215, 10650430, 21300860]

約数ペア:

[(1, 21300860), (2, 10650430), (4, 5325215), (5, 4260172), (7, 3042980), (10, 2130086), (14, 1521490), (20, 1065043), (28, 760745), (35, 608596), (70, 304298), (140, 152149), (233, 91420), (466, 45710), (653, 32620), (932, 22855), (1165, 18284), (1306, 16310), (1631, 13060), (2330, 9142), (2612, 8155), (3262, 6530), (3265, 6524), (4571, 4660)]