21980860

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{31}}^1\times {\mathrm{293}}^1$

素因数の和:355

約数の個数: 72

約数和(自身を含む): 52553088

約数和(自身を除く): 30572228

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 31, 44, 55, 62, 110, 121, 124, 155, 220, 242, 293, 310, 341, 484, 586, 605, 620, 682, 1172, 1210, 1364, 1465, 1705, 2420, 2930, 3223, 3410, 3751, 5860, 6446, 6820, 7502, 9083, 12892, 15004, 16115, 18166, 18755, 32230, 35453, 36332, 37510, 45415, 64460, 70906, 75020, 90830, 99913, 141812, 177265, 181660, 199826, 354530, 399652, 499565, 709060, 999130, 1099043, 1998260, 2198086, 4396172, 5495215, 10990430, 21980860]

約数ペア:

[(1, 21980860), (2, 10990430), (4, 5495215), (5, 4396172), (10, 2198086), (11, 1998260), (20, 1099043), (22, 999130), (31, 709060), (44, 499565), (55, 399652), (62, 354530), (110, 199826), (121, 181660), (124, 177265), (155, 141812), (220, 99913), (242, 90830), (293, 75020), (310, 70906), (341, 64460), (484, 45415), (586, 37510), (605, 36332), (620, 35453), (682, 32230), (1172, 18755), (1210, 18166), (1364, 16115), (1465, 15004), (1705, 12892), (2420, 9083), (2930, 7502), (3223, 6820), (3410, 6446), (3751, 5860)]