20428720

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^2\times {\mathrm{1511}}^1$

素因数の和:1550

約数の個数: 60

約数和(自身を含む): 51465456

約数和(自身を除く): 31036736

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 169, 208, 260, 338, 520, 676, 845, 1040, 1352, 1511, 1690, 2704, 3022, 3380, 6044, 6760, 7555, 12088, 13520, 15110, 19643, 24176, 30220, 39286, 60440, 78572, 98215, 120880, 157144, 196430, 255359, 314288, 392860, 510718, 785720, 1021436, 1276795, 1571440, 2042872, 2553590, 4085744, 5107180, 10214360, 20428720]

約数ペア:

[(1, 20428720), (2, 10214360), (4, 5107180), (5, 4085744), (8, 2553590), (10, 2042872), (13, 1571440), (16, 1276795), (20, 1021436), (26, 785720), (40, 510718), (52, 392860), (65, 314288), (80, 255359), (104, 196430), (130, 157144), (169, 120880), (208, 98215), (260, 78572), (338, 60440), (520, 39286), (676, 30220), (845, 24176), (1040, 19643), (1352, 15110), (1511, 13520), (1690, 12088), (2704, 7555), (3022, 6760), (3380, 6044)]