20912940

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{223}}^1\times {\mathrm{521}}^1$

素因数の和:759

約数の個数: 72

約数和(自身を含む): 63842688

約数和(自身を除く): 42929748

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180, 223, 446, 521, 669, 892, 1042, 1115, 1338, 1563, 2007, 2084, 2230, 2605, 2676, 3126, 3345, 4014, 4460, 4689, 5210, 6252, 6690, 7815, 8028, 9378, 10035, 10420, 13380, 15630, 18756, 20070, 23445, 31260, 40140, 46890, 93780, 116183, 232366, 348549, 464732, 580915, 697098, 1045647, 1161830, 1394196, 1742745, 2091294, 2323660, 3485490, 4182588, 5228235, 6970980, 10456470, 20912940]

約数ペア:

[(1, 20912940), (2, 10456470), (3, 6970980), (4, 5228235), (5, 4182588), (6, 3485490), (9, 2323660), (10, 2091294), (12, 1742745), (15, 1394196), (18, 1161830), (20, 1045647), (30, 697098), (36, 580915), (45, 464732), (60, 348549), (90, 232366), (180, 116183), (223, 93780), (446, 46890), (521, 40140), (669, 31260), (892, 23445), (1042, 20070), (1115, 18756), (1338, 15630), (1563, 13380), (2007, 10420), (2084, 10035), (2230, 9378), (2605, 8028), (2676, 7815), (3126, 6690), (3345, 6252), (4014, 5210), (4460, 4689)]