21556821

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{461}}^1$

素因数の和:597

約数の個数: 32

約数和(自身を含む): 34151040

約数和(自身を除く): 12594219

約数列:

[1, 3, 11, 13, 33, 39, 109, 143, 327, 429, 461, 1199, 1383, 1417, 3597, 4251, 5071, 5993, 15213, 15587, 17979, 46761, 50249, 65923, 150747, 197769, 552739, 653237, 1658217, 1959711, 7185607, 21556821]

約数ペア:

[(1, 21556821), (3, 7185607), (11, 1959711), (13, 1658217), (33, 653237), (39, 552739), (109, 197769), (143, 150747), (327, 65923), (429, 50249), (461, 46761), (1199, 17979), (1383, 15587), (1417, 15213), (3597, 5993), (4251, 5071)]