21903440

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{21061}}^1$

素因数の和:21087

約数の個数: 40

約数和(自身を含む): 54845448

約数和(自身を除く): 32942008

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 21061, 42122, 84244, 105305, 168488, 210610, 273793, 336976, 421220, 547586, 842440, 1095172, 1368965, 1684880, 2190344, 2737930, 4380688, 5475860, 10951720, 21903440]

約数ペア:

[(1, 21903440), (2, 10951720), (4, 5475860), (5, 4380688), (8, 2737930), (10, 2190344), (13, 1684880), (16, 1368965), (20, 1095172), (26, 842440), (40, 547586), (52, 421220), (65, 336976), (80, 273793), (104, 210610), (130, 168488), (208, 105305), (260, 84244), (520, 42122), (1040, 21061)]