21000016

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{1867}}^1$

素因数の和:1931

約数の個数: 40

約数和(自身を含む): 44010080

約数和(自身を除く): 23010064

約数列:

[1, 2, 4, 8, 16, 19, 37, 38, 74, 76, 148, 152, 296, 304, 592, 703, 1406, 1867, 2812, 3734, 5624, 7468, 11248, 14936, 29872, 35473, 69079, 70946, 138158, 141892, 276316, 283784, 552632, 567568, 1105264, 1312501, 2625002, 5250004, 10500008, 21000016]

約数ペア:

[(1, 21000016), (2, 10500008), (4, 5250004), (8, 2625002), (16, 1312501), (19, 1105264), (37, 567568), (38, 552632), (74, 283784), (76, 276316), (148, 141892), (152, 138158), (296, 70946), (304, 69079), (592, 35473), (703, 29872), (1406, 14936), (1867, 11248), (2812, 7468), (3734, 5624)]