20904560

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{809}}^1$

素因数の和:858

約数の個数: 80

約数和(自身を含む): 54237600

約数和(自身を除く): 33333040

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 19, 20, 34, 38, 40, 68, 76, 80, 85, 95, 136, 152, 170, 190, 272, 304, 323, 340, 380, 646, 680, 760, 809, 1292, 1360, 1520, 1615, 1618, 2584, 3230, 3236, 4045, 5168, 6460, 6472, 8090, 12920, 12944, 13753, 15371, 16180, 25840, 27506, 30742, 32360, 55012, 61484, 64720, 68765, 76855, 110024, 122968, 137530, 153710, 220048, 245936, 261307, 275060, 307420, 522614, 550120, 614840, 1045228, 1100240, 1229680, 1306535, 2090456, 2613070, 4180912, 5226140, 10452280, 20904560]

約数ペア:

[(1, 20904560), (2, 10452280), (4, 5226140), (5, 4180912), (8, 2613070), (10, 2090456), (16, 1306535), (17, 1229680), (19, 1100240), (20, 1045228), (34, 614840), (38, 550120), (40, 522614), (68, 307420), (76, 275060), (80, 261307), (85, 245936), (95, 220048), (136, 153710), (152, 137530), (170, 122968), (190, 110024), (272, 76855), (304, 68765), (323, 64720), (340, 61484), (380, 55012), (646, 32360), (680, 30742), (760, 27506), (809, 25840), (1292, 16180), (1360, 15371), (1520, 13753), (1615, 12944), (1618, 12920), (2584, 8090), (3230, 6472), (3236, 6460), (4045, 5168)]