20921992

素因数分解:

$2^3\times 7^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{991}}^1$

素因数の和:1046

約数の個数: 64

約数和(自身を含む): 49996800

約数和(自身を除く): 29074808

約数列:

[1, 2, 4, 7, 8, 13, 14, 26, 28, 29, 52, 56, 58, 91, 104, 116, 182, 203, 232, 364, 377, 406, 728, 754, 812, 991, 1508, 1624, 1982, 2639, 3016, 3964, 5278, 6937, 7928, 10556, 12883, 13874, 21112, 25766, 27748, 28739, 51532, 55496, 57478, 90181, 103064, 114956, 180362, 201173, 229912, 360724, 373607, 402346, 721448, 747214, 804692, 1494428, 1609384, 2615249, 2988856, 5230498, 10460996, 20921992]

約数ペア:

[(1, 20921992), (2, 10460996), (4, 5230498), (7, 2988856), (8, 2615249), (13, 1609384), (14, 1494428), (26, 804692), (28, 747214), (29, 721448), (52, 402346), (56, 373607), (58, 360724), (91, 229912), (104, 201173), (116, 180362), (182, 114956), (203, 103064), (232, 90181), (364, 57478), (377, 55496), (406, 51532), (728, 28739), (754, 27748), (812, 25766), (991, 21112), (1508, 13874), (1624, 12883), (1982, 10556), (2639, 7928), (3016, 6937), (3964, 5278)]