21397750

素因数分解:

$2^1\times 5^3\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{251}}^1$

素因数の和:310

約数の個数: 64

約数和(自身を含む): 45287424

約数和(自身を除く): 23889674

約数列:

[1, 2, 5, 10, 11, 22, 25, 31, 50, 55, 62, 110, 125, 155, 250, 251, 275, 310, 341, 502, 550, 682, 775, 1255, 1375, 1550, 1705, 2510, 2750, 2761, 3410, 3875, 5522, 6275, 7750, 7781, 8525, 12550, 13805, 15562, 17050, 27610, 31375, 38905, 42625, 62750, 69025, 77810, 85250, 85591, 138050, 171182, 194525, 345125, 389050, 427955, 690250, 855910, 972625, 1945250, 2139775, 4279550, 10698875, 21397750]

約数ペア:

[(1, 21397750), (2, 10698875), (5, 4279550), (10, 2139775), (11, 1945250), (22, 972625), (25, 855910), (31, 690250), (50, 427955), (55, 389050), (62, 345125), (110, 194525), (125, 171182), (155, 138050), (250, 85591), (251, 85250), (275, 77810), (310, 69025), (341, 62750), (502, 42625), (550, 38905), (682, 31375), (775, 27610), (1255, 17050), (1375, 15562), (1550, 13805), (1705, 12550), (2510, 8525), (2750, 7781), (2761, 7750), (3410, 6275), (3875, 5522)]