20504745

素因数分解:

$3^4\times 5^1\times {\mathrm{197}}^1\times {\mathrm{257}}^1$

素因数の和:471

約数の個数: 40

約数和(自身を含む): 37086984

約数和(自身を除く): 16582239

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 197, 257, 405, 591, 771, 985, 1285, 1773, 2313, 2955, 3855, 5319, 6939, 8865, 11565, 15957, 20817, 26595, 34695, 50629, 79785, 104085, 151887, 253145, 455661, 759435, 1366983, 2278305, 4100949, 6834915, 20504745]

約数ペア:

[(1, 20504745), (3, 6834915), (5, 4100949), (9, 2278305), (15, 1366983), (27, 759435), (45, 455661), (81, 253145), (135, 151887), (197, 104085), (257, 79785), (405, 50629), (591, 34695), (771, 26595), (985, 20817), (1285, 15957), (1773, 11565), (2313, 8865), (2955, 6939), (3855, 5319)]