21505900

素因数分解:

$2^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{233}}^1$

素因数の和:331

約数の個数: 72

約数和(自身を含む): 51184224

約数和(自身を除く): 29678324

約数列:

[1, 2, 4, 5, 10, 13, 20, 25, 26, 50, 52, 65, 71, 100, 130, 142, 233, 260, 284, 325, 355, 466, 650, 710, 923, 932, 1165, 1300, 1420, 1775, 1846, 2330, 3029, 3550, 3692, 4615, 4660, 5825, 6058, 7100, 9230, 11650, 12116, 15145, 16543, 18460, 23075, 23300, 30290, 33086, 46150, 60580, 66172, 75725, 82715, 92300, 151450, 165430, 215059, 302900, 330860, 413575, 430118, 827150, 860236, 1075295, 1654300, 2150590, 4301180, 5376475, 10752950, 21505900]

約数ペア:

[(1, 21505900), (2, 10752950), (4, 5376475), (5, 4301180), (10, 2150590), (13, 1654300), (20, 1075295), (25, 860236), (26, 827150), (50, 430118), (52, 413575), (65, 330860), (71, 302900), (100, 215059), (130, 165430), (142, 151450), (233, 92300), (260, 82715), (284, 75725), (325, 66172), (355, 60580), (466, 46150), (650, 33086), (710, 30290), (923, 23300), (932, 23075), (1165, 18460), (1300, 16543), (1420, 15145), (1775, 12116), (1846, 11650), (2330, 9230), (3029, 7100), (3550, 6058), (3692, 5825), (4615, 4660)]