21087440

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{773}}^1$

素因数の和:828

約数の個数: 80

約数和(自身を含む): 55282176

約数和(自身を除く): 34194736

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 31, 40, 44, 55, 62, 80, 88, 110, 124, 155, 176, 220, 248, 310, 341, 440, 496, 620, 682, 773, 880, 1240, 1364, 1546, 1705, 2480, 2728, 3092, 3410, 3865, 5456, 6184, 6820, 7730, 8503, 12368, 13640, 15460, 17006, 23963, 27280, 30920, 34012, 42515, 47926, 61840, 68024, 85030, 95852, 119815, 136048, 170060, 191704, 239630, 263593, 340120, 383408, 479260, 527186, 680240, 958520, 1054372, 1317965, 1917040, 2108744, 2635930, 4217488, 5271860, 10543720, 21087440]

約数ペア:

[(1, 21087440), (2, 10543720), (4, 5271860), (5, 4217488), (8, 2635930), (10, 2108744), (11, 1917040), (16, 1317965), (20, 1054372), (22, 958520), (31, 680240), (40, 527186), (44, 479260), (55, 383408), (62, 340120), (80, 263593), (88, 239630), (110, 191704), (124, 170060), (155, 136048), (176, 119815), (220, 95852), (248, 85030), (310, 68024), (341, 61840), (440, 47926), (496, 42515), (620, 34012), (682, 30920), (773, 27280), (880, 23963), (1240, 17006), (1364, 15460), (1546, 13640), (1705, 12368), (2480, 8503), (2728, 7730), (3092, 6820), (3410, 6184), (3865, 5456)]