21047140

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{83}}^1\times {\mathrm{409}}^1$

素因数の和:532

約数の個数: 48

約数和(自身を含む): 46287360

約数和(自身を除く): 25240220

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 83, 124, 155, 166, 310, 332, 409, 415, 620, 818, 830, 1636, 1660, 2045, 2573, 4090, 5146, 8180, 10292, 12679, 12865, 25358, 25730, 33947, 50716, 51460, 63395, 67894, 126790, 135788, 169735, 253580, 339470, 678940, 1052357, 2104714, 4209428, 5261785, 10523570, 21047140]

約数ペア:

[(1, 21047140), (2, 10523570), (4, 5261785), (5, 4209428), (10, 2104714), (20, 1052357), (31, 678940), (62, 339470), (83, 253580), (124, 169735), (155, 135788), (166, 126790), (310, 67894), (332, 63395), (409, 51460), (415, 50716), (620, 33947), (818, 25730), (830, 25358), (1636, 12865), (1660, 12679), (2045, 10292), (2573, 8180), (4090, 5146)]